| Первая буква | Код | Регион или город | Код | Регион или город | Код | Регион или город |
| A |
A | London (1903–64) | AA | Hampshire (1903–74) Salisbury (1974–80) Bournemouth (for Salisbury) (from 1980) | AB | Worcestershire (1903–74) Worcester (from 1974) |
| AC | Warwickshire (1903–74) Coventry (1974–96) | AD | Gloucestershire (1903–74) Gloucester (1974–97) | AE | Bristol |
| AF | Cornwall (1903–74) Truro (from 1974) | AG | Ayrshire (1925–74) Hull (from 1974) | AH | Norfolk (1903–74) Norwich (from 1974) |
| AJ | Yorkshire (North Riding) (1903–74) Middlesbrough (from 1974) | AK | Bradford (1903–74) Sheffield (from 1974) | AL | Nottinghamshire (1903–74) Nottingham (from 1974) |
| AM | Wiltshire (1903–74) Swindon (1974–97) Bristol (for Swindon) (from 1997) | AN | West Ham (1903–65) London (1965–74) Reading (from 1974) (MAN reserved for Isle of Man) | AO | Cumberland (1903–74) Carlisle (from 1974) |
| AP | East Sussex (1903–74) Brighton (from 1974) | AR | Hertfordshire (1903–74) Chelmsford (from 1974) | AS | Nairnshire (1903–74) Inverness (from 1974) |
| AT | Hull | AU | Nottingham | AV | Aberdeenshire (1926–74) Peterborough (from 1974) |
| AW | Shropshire (1903–74) Shrewsbury (from 1974) | AX | Monmouthshire (1903–74) Cardiff (from 1974) | AY | Leicestershire (1903–74) Leicester (1974–96) Nottingham (for Leicester) (from 1996) |
| B |
B | Lancashire (1903–63) | BA | Salford (1903–74) Manchester (from 1974) | BB | Newcastle upon Tyne |
| BC | Leicester (1903–96) Nottingham (for Leicester) (from 1996) | BD | Northamptonshire (1903–74) Northampton (from 1974) | BE | Lincolnshire (Lindsey) (1903–74) Grimsby (1974–81) Lincoln (for Grimsby) (from 1981) |
| BF | Dorset (1903–05) Staffordshire (1960–74) Stoke-on-Trent (1974–97) Nottingham (for Stoke-on-Trent) (from 1997) | BG | Birkenhead (1931–74) Liverpool (1974–96) | BH | Buckinghamshire (1903–74) Luton (from 1974) |
| BJ | East Suffolk (1903–74) Ipswich (from 1974) | BK | Portsmouth | BL | Berkshire (1903–74) Reading (from 1974) |
| BM | Bedfordshire (1903–74) Luton (from 1974) | BN | Bolton (1903–81) Manchester (for Bolton) (from 1981) | BO | Cardiff |
| BP | West Sussex (1903–74) Portsmouth (from 1974) | BR | Sunderland (1903–74) Durham (1974–81) Newcastle upon Tyne (for Durham) (from 1981) | BS | Orkney (1903–74) Kirkwall (1974–80) Inverness (for Kirkwall) (from 1980) |
| BT | Yorkshire (East Riding) (1903–74) York (1974–81) Leeds (for York) (from 1981) | BU | Oldham (1903–74) Manchester (from 1974) | BV | Blackburn (1930–74) Preston (from 1974) |
| BW | Oxfordshire (1903–74) Oxford (from 1974) | BX | Carmarthenshire (1903–74) Haverfordwest (1974–96) Swansea (for Haverfordwest) (from 1996) | BY | Croydon (1903–65) London (1965–74) London North-West (from 1974) |
| C |
C | Yorkshire (West Riding) (1903–64) | CA | Denbighshire (1903–74) Chester (from 1974) | CB | Blackburn (1903–74) Bolton (1974–81) Manchester (for Bolton) (from 1981) |
| CC | Caernarfonshire (1903–74) Bangor (from 1974) | CD | Brighton | CE | Cambridgeshire (1903–65) Cambridgeshire and Isle of Ely (1965–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) |
| CF | West Suffolk (1903–74) Reading (from 1974) | CG | Hampshire (1931–74) Salisbury (1974–80) Bournemouth (for Salisbury) (from 1980) | CH | Derby (1903–74) Nottingham (from 1974) |
| CJ | Herefordshire (1903–74) Hereford (1974–81) Gloucester (for Hereford) (1981–97) | CK | Preston | CL | Norwich |
| CM | Birkenhead (1903–74) Liverpool (1974–96) | CN | Gateshead (1903–74) Newcastle upon Tyne (from 1974) | CO | Plymouth (1903–80) unused after 1980 |
| CP | Halifax (1903–74) Huddersfield (1974–95) | CR | Southampton (1903–74) Portsmouth (from 1974) | CS | Ayrshire (1934–74) Ayr (1974–81) Glasgow (for Ayr) (from 1981) |
| CT | Lincolnshire (Kesteven) (1903–74) Boston (1974–81) Lincoln (for Boston) (from 1981) | CU | South Shields (1903–74) Newcastle upon Tyne (from 1974) | CV | Cornwall (1929–74) Truro (from 1974) |
| CW | Burnley (1903–74) Preston (from 1974) | CX | Huddersfield | CY | Swansea (SCY used for Isles of Scilly) |
| D |
D | Kent (1903–64) | DA | Wolverhampton (1903–74) Birmingham (from 1974) | DB | Stockport (1903–74) Manchester (from 1974) |
| DC | Middlesbrough | DD | Gloucestershire (1921–74) Gloucester (1974–97) | DE | Pembrokeshire (1903–74) Haverfordwest (1974–96) Swansea (for Haverfordwest) (from 1996) |
| DF | Northampton (1903–05) Gloucestershire (1926–74) Gloucester (1974–97) | DG | Gloucestershire (1930–74) Gloucester (1974–97) | DH | Walsall (1903–74) Dudley (1974–96) |
| DJ | St Helens (1903–74) Warrington (1974–81) Liverpool (for Warrington) (1981–96) | DK | Rochdale (1903–74) Bolton (1974–81) Manchester (for Bolton) (from 1981) | DL | Isle of Wight (1903–74) Newport (IoW) (1974–81) Portsmouth (for IoW) (from 1981) |
| DM | Flintshire (1903–74) Chester (from 1974) | DN | York (1903–81) Leeds (for York) (from 1981) | DO | Lincolnshire (Holland) (1903–74) Boston (1974–81) Lincoln (for Boston) (from 1981) |
| DP | Reading | DR | Devonport (1903–14) Plymouth (1926–80) unused after 1980 | DS | Peeblesshire (1903–74) Glasgow (from 1974) |
| DT | Doncaster (1927–74) Sheffield (from 1974) | DU | Coventry | DV | Devon (1929–74) Exeter (from 1974) |
| DW | Newport (1903–74) Cardiff (from 1974) | DX | Ipswich | DY | Hastings (1903–80) Brighton (for Hastings) (from 1980) |
| E |
E | Staffordshire (1903–63) | EA | West Bromwich (1903–74) Dudley (1974–96) | EB | Isle of Ely (1903–65) Cambridgeshire and Isle of Ely (1965–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) |
| EC | Westmorland (1903–74) Kendal (1974–81) Preston (for Kendal) (from 1981) | ED | Liverpool (Warrington until 1981) | EE | Grimsby (1903–81) Lincoln (for Grimsby) (from 1981) |
| EF | West Hartlepool (1903–74) Middlesbrough (from 1974) | EG | Soke of Peterborough (1931–65) Huntingdon and Peterborough (1965–74) Peterborough (from 1974) | EH | Stoke-on-Trent (1903–97) Nottingham (for Stoke-on-Trent) (from 1997) |
| EJ | Haverfordwest (Cardiganshire until 1974 Aberystwyth until 1981) | EK | Wigan (1903–74) Warrington (1974–81) Liverpool (for Warrington) (1981–96) | EL | Bournemouth |
| EM | Bootle (1903–74) Liverpool (1974–96) | EN | Bury (1903–74) Bolton (1974–81) Manchester (for Bolton) (from 1981) | EO | Barrow-in-Furness (1903–81) Preston (for Barrow-in-Furness) (from 1981) |
| EP | Montgomeryshire (1903–74) Swansea (from 1974) | ER | Cambridgeshire (1922–65) Cambridgeshire and Isle of Ely (1965–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) | ES | Perthshire (1903–74) Dundee (from 1974) |
| ET | Rotherham (1903–74) Sheffield (from 1974) | EU | Breconshire (1903–74) Bristol (from 1974) | EV | Essex (1931–74) Chelmsford (from 1974) |
| EW | Huntingdonshire (1903–65) Huntingdon and Peterborough (1965–74) Peterborough (from 1974) | EX | Great Yarmouth (1903–74) Norwich (from 1974) | EY | Anglesey (1903–74) Bangor (from 1974) |
| F |
F | Essex (1903–63) | FA | Burton upon Trent (1903–74) Stoke-on-Trent (1974–97) Nottingham (for Stoke-on-Trent) (from 1997) | FB | Bath (1903–74) Bristol (from 1974) |
| FC | Oxford | FD | Dudley | FE | Lincoln |
| FF | Bangor (Merionethshire until 1974 Aberystwyth until 1981) | FG | Fife (1925–74) Brighton (from 1974) | FH | Gloucester |
| FJ | Exeter | FK | Worcester (1903–74) Dudley (1974–96) | FL | Soke of Peterborough (1903–65) Huntingdon and Peterborough (1965–74) Peterborough (from 1974) |
| FM | Chester | FN | Canterbury (1903–81) unused after 1981 | FO | Gloucester (Radnorshire until 1974 Hereford for Radnorshire until 1981) |
| FP | Rutland (1903–74) Leicester (1974–96) Nottingham (for Leicester) (from 1996) | FR | Blackpool (1904–74) Preston (from 1974) | FS | Edinburgh (from 1931) |
| FT | Tynemouth (1904–74) Newcastle upon Tyne (from 1974) | FU | Lincolnshire (Lindsey) (1922–74) Grimsby (1974–81) Lincoln (for Grimsby) (from 1981) | FV | Blackpool (1929–74) Preston (from 1974) |
| FW | Lincolnshire (Lindsey) (1929–74) Lincoln (from 1974) | FX | Dorset (1905–74) Bournemouth (from 1974) | FY | Southport (1905–74) Liverpool (1974–96) |
| G |
G | Glasgow (1903–63) | GA | Glasgow | GB | Glasgow |
| GC | London (1929–74) London South-West (from 1974) | GD | Glasgow | GE | Glasgow |
| GF | London (1930–74) London South-West (from 1974) | GG | Glasgow | GH | London (1930–74) London South-West (from 1974) |
| GJ | London (1930–74) London South-West (from 1974) | GK | London (1930–74) London South-West (from 1974) | GL | Bath (1932–74) Truro (from 1974) |
| GM | Motherwell and Wishaw (1920–74) Reading (from 1974) | GN | London (1931–74) London South-West (from 1974) | GO | London (1931–74) London South-West (from 1974) |
| GP | London (1931–74) London South-West (from 1974) | GR | Sunderland (1933–74) Durham (1974–81) Newcastle upon Tyne (for Durham) (from 1981) | GS | Perthshire (1928–74) Luton (from 1974) |
| GT | London (1931–74) London South-West (from 1974) | GU | London (1929–74) London South-East (from 1974) | GV | West Suffolk (1930–74) Ipswich (from 1974) |
| GW | London (1931–74) London South-East (from 1974) | GX | London (1932–74) London South-East (from 1974) | GY | London (1932–74) London South-East (from 1974) |
| H |
H | Middlesex (1903–63) | HA | Smethwick (1907–74) Dudley (1974–96) | HB | Merthyr Tydfil (1908–74) Cardiff (from 1974) |
| HC | Eastbourne (1911–74) Hastings (1974–80) Brighton (for Hastings) (from 1980) | HD | Dewsbury (1913–74) Huddersfield (1974–95) | HE | Barnsley (1913–74) Sheffield (from 1974) |
| HF | Wallasey (1913–74) Liverpool (1974–96) | HG | Burnley (1930–74) Preston (from 1974) | HH | Carlisle |
| HJ | Southend-on-Sea (1914–74) Chelmsford (from 1974) | HK | Essex (1915–74) Chelmsford (from 1974) | HL | Wakefield (1915–74) Sheffield (from 1974) |
| HM | East Ham (1916–65) London (1965–74) London Central (1974–97) | HN | Darlington (1921–74) Middlesbrough (from 1974) | HO | Hampshire (1917–74) Salisbury (1974–80) Bournemouth (for Salisbury) (from 1980) |
| HP | Coventry (from 1919) | HR | Wiltshire (1919–74) Swindon (1974–97) Bristol (for Swindon) (from 1997) | HS | Renfrewshire (1903–74) Glasgow (from 1974) |
| HT | Bristol (from 1920) | HU | Bristol (from 1924) | HV | East Ham (1930–65) London (1965–74) London Central (1974–97) |
| HW | Bristol (from 1927) | HX | Middlesex (1930–65) London (1965–74) London Central (1974–97) | HY | Bristol (from 1930) |
| J |
J | Durham (1903–64) | JA | Stockport (1929–74) Manchester (from 1974) | JB | Berkshire (1932–74) Reading (from 1974) |
| JC | Caernarfonshire (1931–74) Bangor (from 1974) | JD | West Ham (1929–65) London (1965–74) London Central (1974–97) | JE | Isle of Ely (1933–65) Cambridgeshire and Isle of Ely (1965–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) |
| JF | Leicester (1930–96) Nottingham (for Leicester) (from 1996) | JG | Canterbury (1929–81) unused after 1981 | JH | Hertfordshire (1931–74) Reading (from 1974) |
| JJ | London (1932–74) Canterbury (1974–81) unused after 1981 | JK | Eastbourne (1928–74) Hastings (1974–80) Brighton (for Hastings) (from 1980) | JL | Lincolnshire (Holland) (1932–74) Boston (1974–81) Lincoln (for Boston) (from 1981) |
| JM | Westmorland (1931–74) Reading (from 1974) | JN | Southend-on-Sea (1930–74) Chelmsford (from 1974) | JO | Oxford (from 1930) |
| JP | Wigan (1934–74) Warrington (1974–81) Liverpool (for Warrington) (1981–96) | JR | Northumberland (1932–74) Newcastle upon Tyne (from 1974) | JS | Ross and Cromarty (1903–74) Stornoway (1974–80) Inverness (for Stornoway) (from 1980) |
| JT | Dorset (1933–74) Bournemouth (from 1974) | JU | Leicestershire (1931–74) Leicester (1974–96) Nottingham (for Leicester) (from 1996) | JV | Grimsby (1930–81) Lincoln (for Grimsby) (from 1981) |
| JW | Wolverhampton (1931–74) Birmingham (from 1974) | JX | Halifax (1932–74) Huddersfield (1974–95) | JY | Plymouth (1932–80) unused after 1980 |
| K |
K | Liverpool (1903–64) | KA | Liverpool (from 1925) | KB | Liverpool (from 1914) |
| KC | Liverpool (from 1920) | KD | Liverpool (from 1927) | KE | Kent (1920–74) Maidstone (from 1974) |
| KF | Liverpool (from 1930) | KG | Cardiff (from 1931) | KH | Hull (from 1925) |
| KJ | Kent (1931–74) Maidstone (from 1974) | KK | Kent (1922–74) Maidstone (from 1974) | KL | Kent (1924–74) Maidstone (from 1974) |
| KM | Kent (1925–74) Maidstone (from 1974) | KN | Kent (1917–74) Maidstone (from 1974) | KO | Kent (1927–74) Maidstone (from 1974) |
| KP | Kent (1928–74) Maidstone (from 1974) | KR | Kent (1929–74) Maidstone (from 1974) | KS | Roxburghshire (1903–74) Selkirk (1974–80) Edinburgh (for Selkirk) (from 1980) |
| KT | Kent (1913–74) Canterbury (1974–81) unused after 1981 | KU | Bradford (1922–74) Sheffield (from 1974) | KV | Coventry (from 1931) |
| KW | Bradford (1926–74) Sheffield (from 1974) | KX | Buckinghamshire (1928–74) Luton (from 1974) | KY | Bradford (1931–74) Sheffield (from 1974) |
| L |
L | Glamorgan (1903–64) | LA | London (1910–74) London North-West (from 1974) | LB | London (1908–74) London North-West (from 1974) |
| LC | London (1905–74) London North-West (from 1974) | LD | London (1909–74) London North-West (from 1974) | LE | London (1911–74) London North-West (from 1974) |
| LF | London (1912–74) London North-West (from 1974) | LG | Cheshire (1928–74) Chester (from 1974) | LH | London (1913–74) London North-West (from 1974) |
| LJ | Bournemouth (from 1929) | LK | London (1913–74) London North-West (from 1974) | LL | London (1914–74) London North-West (from 1974) |
| LM | London (1914–74) London North-West (from 1974) | LN | London (1906–74) London North-West (from 1974) | LO | London (1915–74) London North-West (from 1974) |
| LP | London (1915–74) London North-West (from 1974) | LR | London (1916–74) London North-West (from 1974) | LS | Selkirkshire (1903–74) Stirling (1974–81) Edinburgh (for Stirling) (from 1981) |
| LT | London (1918–74) London North-West (from 1974) | LU | London (1919–74) London North-West (from 1974) | LV | Liverpool (from 1932) |
| LW | London (1919–74) London North-West (from 1974) | LX | London (1919–74) London North-West (from 1974) | LY | London (1919–74) London North-West (from 1974) |
| M |
M | Cheshire (1903–63) | MA | Cheshire (1920–74) Chester (from 1974) | MB | Cheshire (1922–74) Chester (from 1974) |
| MC | Middlesex (1917–65) London (1965–74) London North-East (1974–97) | MD | Middlesex (1920–65) London (1965–74) London North-East (1974–97) | ME | Middlesex (1921–65) London (1965–74) London North-East (1974–97) |
| MF | Middlesex (1923–65) London (1965–74) London North-East (1974–97) | MG | Middlesex (1930–65) London (1965–74) London North-East (1974–97) | MH | Middlesex (1924–65) London (1965–74) London North-East (1974–97) |
| MJ | Bedfordshire (1932–74) Luton (from 1974) | MK | Middlesex (1925–65) London (1965–74) London North-East (1974–97) | ML | Middlesex (1926–65) London (1965–74) London North-East (1974–97) |
| MM | Middlesex (1926–65) London (1965–74) London North-East (1974–97) | MN | Isle of Man | MO | Berkshire (1922–74) Reading (from 1974) |
| MP | Middlesex (1927–65) London (1965–74) London North-East (1974–97) | MR | Wiltshire (1924–74) Swindon (1974–97) Bristol (for Swindon) (from 1997) | MS | Stirlingshire (1903–74) Stirling (1974–81) Edinburgh (for Stirling) (from 1981) |
| MT | Middlesex (1928–65) London (1965–74) London North-East (1974–97) | MU | Middlesex (1929–65) London (1965–74) London North-East (1974–97) | MV | Middlesex (1931–65) London (1965–74) London South-East (from 1974) |
| MW | Wiltshire (1927–74) Swindon (1974–97) Bristol (for Swindon) (from 1997) | MX | Middlesex (1912–65) London (1965–74) London South-East (from 1974) | MY | Middlesex (1929–65) London (1965–74) London South-East (from 1974) |
| N |
N | Manchester (1903–64) | NA | Manchester (from 1913) | NB | Manchester (from 1919) |
| NC | Manchester (from 1920) | ND | Manchester (from 1923) | NE | Manchester (from 1925) |
| NF | Manchester (from 1926) | NG | Norfolk (1930–74) Norwich (from 1974) | NH | Northampton (from 1905) |
| NJ | East Sussex (1932–74) Brighton (from 1974) | NK | Hertfordshire (1921–74) Luton (from 1974) | NL | Northumberland (1921–74) Newcastle upon Tyne (from 1974) |
| NM | Bedfordshire (1920–74) Luton (from 1974) | NN | Nottinghamshire (1921–74) Nottingham (from 1974) | NO | Essex (1921–74) Chelmsford (from 1974) |
| NP | Worcestershire (1921–74) Worcester (from 1974) | NR | Leicestershire (1921–74) Leicester (1974–96) Nottingham (for Leicester) (from 1996) | NS | Sutherland (1903–74) Glasgow (from 1974) |
| NT | Shropshire (1921–74) Shrewsbury (from 1974) | NU | Derbyshire (1923–74) Nottingham (from 1974) | NV | Northamptonshire (1931–74) Northampton (from 1974) |
| NW | Leeds (from 1921) | NX | Warwickshire (1921–74) Dudley (1974–96) | NY | Glamorgan (1921–74) Cardiff (from 1974) |
| O |
O | Birmingham (1903–64) | OA | Birmingham (from 1913) | OB | Birmingham (from 1915) |
| OC | Birmingham (from 1933) | OD | Devon (1931–74) Exeter (from 1974) | OE | Birmingham (from 1919) |
| OF | Birmingham (from 1929) | OG | Birmingham (from 1930) | OH | Birmingham (from 1920) |
| OJ | Birmingham (from 1932) | OK | Birmingham (from 1922) | OL | Birmingham (from 1923) |
| OM | Birmingham (from 1924) | ON | Birmingham (from 1925) | OO | Essex (1961–74) Chelmsford (from 1974) |
| OP | Birmingham (from 1926) | OR | Hampshire (1922–74) Portsmouth (from 1974) | OS | Wigtownshire (1903–74) Stranraer (1974–81) Glasgow (for Stranraer) (from 1981) |
| OT | Hampshire (1926–74) Portsmouth (from 1974) | OU | Hampshire (1928–74) Bristol (from 1974) | OV | Birmingham (from 1931) |
| OW | Southampton (1931–74) Portsmouth (from 1974) | OX | Birmingham (from 1927) | OY | Croydon (1930–65) London (1965–74) London North-West (from 1974) |
| P |
P | Surrey (1903–63) | PA | Surrey (1913–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PB | Surrey (1919–74) Guildford (1974–97) Reading (for Guildford) (from 1997) |
| PC | Surrey (1921–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PD | Surrey (1923–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PE | Surrey (1924–74) Guildford (1974–97) Reading (for Guildford) (from 1997) |
| PF | Surrey (1926–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PG | Surrey (1929–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PH | Surrey (1927–74) Guildford (1974–97) Reading (for Guildford) (from 1997) |
| PJ | Surrey (1931–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PK | Surrey (1928–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PL | Surrey (1930–74) Guildford (1974–97) Reading (for Guildford) (from 1997) |
| PM | East Sussex (1922–74) Guildford (1974–97) Reading (for Guildford) (from 1997) | PN | East Sussex (1927–74) Brighton (from 1974) | PO | West Sussex (1929–74) Portsmouth (from 1974) (GPO formerly reserved for General Post Office vehicles) |
| PP | Buckinghamshire (1923–74) Luton (from 1974) | PR | Dorset (1923–74) Bournemouth (from 1974) | PS | Shetland (1903–74) Lerwick (1974–80) Aberdeen (for Lerwick) (from 1980) |
| PT | Durham (1922–81) Newcastle upon Tyne (for Durham) (from 1981) | PU | Essex (1923–74) Chelmsford (from 1974) | PV | Ipswich (from 1932) |
| PW | Norfolk (1923–74) Norwich (from 1974) | PX | West Sussex (1923–74) Portsmouth (from 1974) | PY | Yorkshire (North Riding) (1923–74) Middlesbrough (from 1974) |
| R |
R | Derbyshire (1903–64) | RA | Derbyshire (1926–74) Nottingham (from 1974) | RB | Derbyshire (1929–74) Nottingham (from 1974) |
| RC | Derby (1931–74) Nottingham (from 1974) | RD | Reading (from 1928) | RE | Staffordshire (1921–74) Stoke-on-Trent (1974–97) Nottingham (for Stoke-on-Trent) (from 1997) |
| RF | Staffordshire (1924–74) Stoke-on-Trent (1974–97) Nottingham (for Stoke-on-Trent) (from 1997) | RG | Aberdeen (1928–74) Newcastle upon Tyne (from 1974) | RH | Hull (from 1930) |
| RJ | Salford (1931–74) Manchester (from 1974) | RK | Croydon (1922–65) London (1965–74) London North-West (from 1974) | RL | Cornwall (1924–74) Truro (from 1974) |
| RM | Cumberland (1924–74) Carlisle (from 1974) | RN | Preston (from 1928) | RO | Hertfordshire (1925–74) Luton (from 1974) |
| RP | Northamptonshire (1924–74) Northampton (from 1974) | RR | Nottinghamshire (1925–74) Nottingham (from 1974) | RS | Aberdeen |
| RT | East Suffolk (1925–74) Ipswich (from 1974) | RU | Bournemouth (from 1924) | RV | Portsmouth (from 1931) |
| RW | Coventry (from 1924) | RX | Berkshire (1927–74) Reading (from 1974) | RY | Leicester (1925–96) Nottingham (for Leicester) (from 1996) |
| S |
S | Edinburgh (1903–64) | SA | Aberdeenshire (1903–74) Aberdeen (from 1974) | SB | Argyll (1903–74) Oban (1974–80) Glasgow (for Oban) (from 1981) |
| SC | Edinburgh (from 1927) | SD | Ayrshire (1903–74) Ayr (1974–81) Glasgow (for Ayr) (from 1981) | SE | Banffshire (1903–74) Keith (1974–81) Aberdeen (for Keith) (from 1981) |
| SF | Edinburgh (from 1924) | SG | Edinburgh (from 1920) | SH | Berwickshire (1903–74) Selkirk (1974–80) Edinburgh (for Selkirk) (from 1980) |
| SJ | Bute (1903–74) Ayr (1974–81) Glasgow (for Ayr) (from 1981) | SK | Caithness (1903–74) Wick (1974–81) Inverness (for Wick) (from 1981) | SL | Clackmannanshire (1903–74) Dundee (from 1974) |
| SM | Dumfriesshire (1903–74) Dumfries (1974–81) Carlisle (for Dumfries) (from 1981) | SN | Dunbartonshire (1903–74) Dundee (from 1974) | SO | Moray (1903–74) Aberdeen (from 1974) |
| SP | Fife (1903–74) Dundee (from 1974) | SR | Angus (1903–74) Dundee (from 1974) | SS | East Lothian (1903–74) Aberdeen (from 1974) |
| ST | Inverness-shire (1903–74) Inverness (from 1974) | SU | Kincardineshire (1903–74) Glasgow (from 1974) | SV | Kinross-shire (1903–74) unused after 1974 |
| SW | Kirkcudbrightshire (1903–74) Dumfries (1974–81) Carlisle (for Dumfries) (from 1981) | SX | West Lothian (1903–74) Edinburgh (from 1974) | SY | Midlothian (1903–74) unused after 1974 |
| T |
T | Devon (1903–64) | TA | Devon (1920–74) Exeter (from 1974) | TB | Lancashire (1919–74) Warrington (1974–81) Liverpool (for Warrington) (1981–96) |
| TC | Lancashire (1922–74) Bristol (from 1974) | TD | Lancashire (1924–74) Bolton (1974–81) Manchester (for Bolton) (from 1981) | TE | Lancashire (1927–74) Bolton (1974–81) Manchester (for Bolton) (from 1981) |
| TF | Lancashire (1929–74) Reading (from 1974) | TG | Glamorgan (1930–74) Cardiff (from 1974) | TH | Carmarthenshire (1929–74) Swansea (from 1974) |
| TJ | Lancashire (1932–74) Liverpool (1974–96) | TK | Dorset (1927–74) Plymouth (1974–80) unused after 1980 | TL | Lincolnshire (Kesteven) (1928–74) Lincoln (from 1974) |
| TM | Bedfordshire (1927–74) Luton (from 1974) | TN | Newcastle upon Tyne (from 1925) | TO | Nottingham (from 1924) |
| TP | Portsmouth (from 1924) | TR | Southampton (1925–74) Portsmouth (from 1974) | TS | Dundee |
| TT | Devon (1924–74) Exeter (from 1974) | TU | Cheshire (1926–74) Chester (from 1974) | TV | Nottingham (from 1929) |
| TW | Essex (1925–74) Chelmsford (from 1974) | TX | Glamorgan (1926–74) Cardiff (from 1974) | TY | Northumberland (1925–74) Newcastle upon Tyne (from 1974) |
| U |
U | Leeds (1903–64) | UA | Leeds (from 1927) | UB | Leeds (from 1929) |
| UC | London (1928–74) London Central (1974–97) | UD | Oxfordshire (1926–74) Oxford (from 1974) | UE | Warwickshire (1925–74) Dudley (1974–96) |
| UF | Brighton (from 1925) | UG | Leeds (from 1932) | UH | Cardiff (from 1925) |
| UJ | Shropshire (1932–74) Shrewsbury (from 1974) | UK | Wolverhampton (1925–74) Birmingham (from 1974) | UL | London (1929–74) London Central (1974–97) |
| UM | Leeds (from 1925) | UN | Denbighshire (1927–74) Barnstaple (1974–81) Exeter (for Barnstaple) (1981) | UO | Devon (1926–74) Barnstaple (1974–81) Exeter (for Barnstaple) (1981) |
| UP | Durham (1927–81) Newcastle upon Tyne (for Durham) (from 1981) | UR | Hertfordshire (1928–74) Luton (from 1974) | US | Govan (1903–12) Glasgow (from 1933) |
| UT | Leicestershire (1927–74) Leicester (1974–96) Nottingham (for Leicester) (from 1996) | UU | London (1929–74) London Central (1974–97) | UV | London (1929–74) London Central (1974–97) |
| UW | London (1929–74) London Central (1974–97) | UX | Shropshire (1927–74) Shrewsbury (from 1974) | UY | Worcestershire (1927–74) Worcester (from 1974) |
| V |
V | Lanarkshire (1903–64) | VA | Lanarkshire (1922–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) | VB | Croydon (1927–65) London (1965–74) Canterbury (1974–81) unused after 1981 |
| VC | Coventry (from 1929) | VD | Lanarkshire (1930–74) Luton (1974–77) unused after 1977 | VE | Cambridgeshire (1928–65) Cambridgeshire and Isle of Ely (1965–74) Cambridge (1974–80) Peterborough (for Cambridge) (from 1980) |
| VF | Norfolk (1927–74) Norwich (from 1974) | VG | Norwich (from 1927) | VH | Huddersfield (1927–95) |
| VJ | Herefordshire (1927–74) Hereford (1974–81) Gloucester (for Hereford) (1981–97) | VK | Newcastle upon Tyne (from 1929) | VL | Lincoln (from 1928) |
| VM | Manchester (from 1928) | VN | Yorkshire (North Riding) (1929–74) Middlesbrough (from 1974) | VO | Nottinghamshire (1928–74) Nottingham (from 1974) |
| VP | Birmingham (from 1928) | VR | Manchester (from 1929) | VS | Greenock (1903–74) Luton (from 1974) |
| VT | Stoke-on-Trent (1927–97) Nottingham (for Stoke-on-Trent) (from 1997) | VU | Manchester (from 1930) | VV | Northampton (from 1930) |
| VW | Essex (1927–74) Chelmsford (from 1974) | VX | Essex (1929–74) Chelmsford (from 1974) | VY | York (1928–81) Leeds (for York) (from 1981) |
| W |
W | Sheffield (1903–64) | WA | Sheffield (from 1919) | WB | Sheffield (from 1924) |
| WC | Essex (1962–74) Chelmsford (from 1974) | WD | Warwickshire (1930–74) Dudley (1974–96) | WE | Sheffield (from 1927) |
| WF | Yorkshire (East Riding) (1926–74) Sheffield (from 1974) | WG | Stirlingshire (1930–74) Sheffield (from 1974) | WH | Bolton (1927–81) Manchester (for Bolton) (from 1981) |
| WJ | Sheffield (from 1930) | WK | Coventry (from 1926) | WL | Oxford (from 1925) |
| WM | Southport (1927–74) Liverpool (1974–96) | WN | Swansea (from 1927) | WO | Monmouthshire (1927–74) Cardiff (from 1974) |
| WP | Worcestershire (1931–74) Worcester (from 1974) | WR | Yorkshire (West Riding) (1912–74) Leeds (from 1974) | WS | Leith (1903–20) Edinburgh (1934–74) Bristol (from 1974) |
| WT | Yorkshire (West Riding) (1923–74) Leeds (from 1974) | WU | Yorkshire (West Riding) (1925–74) Leeds (from 1974) | WV | Wiltshire (1931–74) Brighton (from 1974) |
| WW | Yorkshire (West Riding) (1927–74) Leeds (from 1974) | WX | Yorkshire (West Riding) (1929–74) Leeds (from 1974) | WY | Yorkshire (West Riding) (1921–74) Leeds (from 1974) |
| X |
X | Northumberland (1903–63) | XA | London (1920–64) Kirkcaldy (1963–74) unused after 1974 | XB | London (1920–64) Coatbridge (1964–74) unused after 1974 |
| XC | London (1920–64) Solihull (1964–74) unused after 1974 | XD | London (1920–64) Luton (1964–74) unused after 1974 | XE | London (1920–64) Luton (1964–74) unused after 1974 |
| XF | London (1921–64) Torbay (1968–74) unused after 1974 | XG | Middlesbrough (1929–74) unused after 1974 | XH | London (1921–64) unused after 1964 |
| XJ | Manchester (1932–74) unused after 1974 | XK | London (1922–64) unused after 1964 | XL | London (1922–64) unused after 1964 |
| XM | London (1922–64) unused after 1964 | XN | London (1923–64) unused after 1964 | XO | London (1923–64) unused after 1964 |
| XP | London (1923–64) later temporary plates for vehicles being exported to Europe | XR | London (1924–64) unused after 1964 | XS | Paisley (1903–74) unused after 1974 |
| XT | London (1924–64) unused after 1964 | XU | London (1924–64) unused after 1964 | XV | London (1928–64) unused after 1964 |
| XW | London (1924–64) unused after 1964 | XX | London (1925–64) unused after 1964 | XY | London (1925–64) unused after 1964 |
| Y |
Y | Somerset (1903–64) | YA | Somerset (1921–74) Taunton (1974–97) Exeter (for Taunton) (from 1997) | YB | Somerset (1924–74) Taunton (1974–97) Exeter (for Taunton) (from 1997) |
| YC | Somerset (1927–74) Taunton (1974–97) Exeter (for Taunton) (from 1997) | YD | Somerset (1930–74) Taunton (1974–97) Exeter (for Taunton) (from 1997) | YE | London (1927–74) London Central (1974–97) |
| YF | London (1927–74) London Central (1974–97) | YG | Yorkshire (West Riding) (1932–74) Leeds (from 1974) | YH | London (1927–74) London Central (1974–97) |
| YJ | Dundee (1932–74) Brighton (from 1974) | YK | London (1925–74) London Central (1974–97) | YL | London (1925–74) London Central (1974–97) |
| YM | London (1925–74) London Central (1974–97) | YN | London (1926–74) London Central (1974–97) | YO | London (1926–74) London Central (1974–97) |
| YP | London (1926–74) London Central (1974–97) | YR | London (1926–74) London Central (1974–97) | YS | Partick (1903–12) Glasgow (from 1935) |
| YT | London (1927–74) London Central (1974–97) | YU | London (1927–74) London Central (1974–97) | YV | London (1928–74) London Central (1974–97) |
| YW | London (1928–74) London Central (1974–97) | YX | London (1928–74) London Central (1974–97) | YY | London (1932–74) London Central (1974–97) |