Caerphilly (UK Parliament constituency)

Not to be confused with Caerphilly (Senedd constituency).

Caerphilly (Welsh: Caerffili) is a constituency^{[n 1]} centred on the town of Caerphilly in South Wales, represented in the House of Commons of the UK Parliament since 2024 by Chris Evans of the Labour Party.^{[n 2]}

Caerphilly
County constituency for the House of Commons
Show location of constituency Show location within Wales Interactive map of boundaries from 2024
Location of the constituency within Wales
Preserved county	Gwent
Electorate	72,458 (March 2020)[1]
Major settlements	Caerphilly, Ystrad Mynach, Pontllanfraith, Hengoed, Nelson
Current constituency
Created	1918
Member of Parliament	Chris Evans (Labour)
Seats	One
Created from	East Glamorganshire
Overlaps
Senedd	Caerphilly, South Wales East

Since its creation, the constituency has always elected Labour MPs, although the predecessor constituency of East Glamorganshire, and prior to that Glamorganshire had elected Liberal MPs throughout the Victorian era.

Boundaries

Map of boundaries 2010–2024

The Caerphilly constituency covers roughly the southern and eastern half of Caerphilly district, the part of the district historically located in Glamorgan. In the northwestern portion of the constituency are communities such as Hengoed and Ystrad Mynach, extending in a southeasterly direction through Caerphilly and Llanbradach to the rural outcrops bordering Cardiff.

2010–2024: The Caerphilly County Borough wards of Aber Valley, Aberbargoed and Bargoed, Bedwas and Trethomas, Gilfach, Hengoed, Llanbradach, Machen and Rudry, Morgan Jones, Nelson, Penyrheol, St Cattwg, St Martins, Van, and Ystrad Mynach.

2024–present: At the 2023 review of Westminster constituencies and under the June 2023 final recommendations of the Boundary Commission for Wales for the 2024 general election, the constituency retained its name but its boundaries altered. Four wards were taken from the abolished Islwyn constituency.^[2] The constituency was defined as being composed of the following wards of the County Borough of Caerphilly, as they existed on 1 December 2020:^[3]

• Aber Valley; Bedwas, Trethomas and Machen; Hengoed; Llanbradach; Maesycwmmer; Morgan Jones; Nelson; Pengam; Penyrheol; Pontllanfraith; St. Cattwg; St. James; St. Martins; Ynysddu; and Ystrad Mynach.

Following a local government boundary review which came into effect in May 2022,^[4] the constituency now comprises the following wards of the County Borough of Caerphilly from the 2024 general election:^[5]

• Aber Valley; Bedwas and Trethomas; Cefn Fforest and Pengam (part); Hengoed; Llanbradach; Machen and Rudry; Maesycwmmer; Morgan Jones; Nelson; Penyrheol; Pontllanfraith; St Cattwg; St Martins; Van; Ynysddu; and Ystrad Mynach.

Members of Parliament

Election		Member[6]	Party
	1918	Alfred Onions	Labour
	1921	Morgan Jones	Labour
	1939	Ness Edwards	Labour
	1968	Fred Evans	Labour
	1979	Ednyfed Hudson Davies	Labour
	1981		SDP
	1983	Ron Davies	Labour
	2001	Wayne David	Labour
	2024	Chris Evans	Labour

Elections

Elections in the 1910s

General election 1918: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Alfred Onions	11,496	54.8	N/A
	Liberal	William Rees Edmunds	9,482	45.2	N/A
Majority			2,014	9.6	N/A
Turnout			20,978	64.0	N/A
Registered electors			32,790
	Labour win (new seat)

Elections in the 1920s

1921 Caerphilly by-election^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	13,699	54.2	−0.6
	Liberal	William Rees Edmunds	8,958	35.5	−9.7
	Communist	Bob Stewart	2,592	10.3	N/A
Majority			4,741	18.7	+9.1
Turnout			25,249	73.2	+9.2
Registered electors			34,511
	Labour hold		Swing	+4.5

General election 1922: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	16,082	57.2	+2.4
	Unionist	Alan McLean	12,057	42.8	N/A
Majority			4,025	14.4	+4.8
Turnout			28,139	78.6	+5.4
Registered electors			35,795
	Labour hold		Swing

General election 1923: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	16,535	58.7	+1.5
	Unionist	Gwilym Rowlands	6,493	23.0	−19.8
	Liberal	Samuel Roberts Jenkins	5,152	18.3	N/A
Majority			10,042	35.7	+21.3
Turnout			28,180	77.0	−1.6
Registered electors			36,592
	Labour hold		Swing	+10.6

General election 1924: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	17,723	59.0	+0.3
	Unionist	Gwilym Rowlands	12,293	41.0	+18.0
Majority			5,430	18.0	−17.7
Turnout			29,996	79.3	+2.3
Registered electors			37,868
	Labour hold		Swing	-8.8

General election 1929: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	21,248	57.9	−1.1
	Liberal	Alice Grace Roberts	8,190	22.4	N/A
	Unionist	Owen Temple-Morris	6,357	17.4	−23.6
	Communist	J R Wilson	829	2.3	N/A
Majority			13,058	35.5	+17.5
Turnout			36,624	81.1	+1.8
Registered electors			45,173
	Labour hold		Swing

Elections in the 1930s

General election 1931: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	23,061	67.6	+9.7
	Conservative	Catherine Bowen-Davies	11,044	32.4	+15.0
Majority			12,017	35.2	−0.3
Turnout			34,105	76.6	−4.5
Registered electors			44,509
	Labour hold		Swing

General election 1935: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Morgan Jones	24,846	76.2	+8.6
	Conservative	Nesta Jessie Stoneham	7,738	23.8	−8.6
Majority			17,108	52.6	+17.4
Turnout			32,584	72.3	−4.3
Registered electors			45,057
	Labour hold		Swing

1939 Caerphilly by-election^[7]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	19,847	68.0	−8.2
	Conservative	Ronald Bell	9,349	32.0	+8.2
Majority			10,498	36.0	−16.6
Turnout			29,196	68.4	−3.9
Registered electors			42,678
	Labour hold		Swing

Elections in the 1940s

General election 1945: Caerphilly^[7]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	29,158	80.2	+4.0
	Conservative	John Frederick Manuel de Courcy	7,189	19.8	−4.0
Majority			21,969	60.4	+7.8
Turnout			36,347	77.2	+4.9
Registered electors			47,078
	Labour hold		Swing

Elections in the 1950s

General election 1950: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	30,270	77.5	−2.7
	Conservative	K J Lloyd	8,771	22.5	+2.7
Majority			21,499	55.0	−5.4
Turnout			39,041	84.3	+7.1
Registered electors			46,321
	Labour hold		Swing

General election 1951: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	30,523	77.1	−0.4
	Conservative	Kenneth Gordon Knee	9,041	22.9	+0.4
Majority			21,482	54.2	−0.8
Turnout			39,564	84.4	+0.1
Registered electors			46,893
	Labour hold		Swing

General election 1955: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	27,852	75.2	−1.9
	Conservative	John H. Davies	9,180	24.8	+1.9
Majority			18,672	50.4	−3.8
Turnout			37,032	78.6	−5.8
Registered electors			47,131
	Labour hold		Swing

General election 1959: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	28,154	72.7	−2.5
	Conservative	W Russell Lewis	7,181	18.5	−6.3
	Plaid Cymru	John D. A. Howell	3,420	8.8	N/A
Majority			20,973	54.2	+3.8
Turnout			38,735	83.0	+4.4
Registered electors			46,671
	Labour hold		Swing

Elections in the 1960s

General election 1964: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	26,001	72.1	−0.6
	Conservative	Ronald J Maddocks	6,086	16.9	−1.6
	Plaid Cymru	Phil Williams	3,956	11.0	+2.2
Majority			19,915	55.2	+1.0
Turnout			36,043	78.4	−4.6
Registered electors			45,969
	Labour hold		Swing

General election 1966: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Ness Edwards	26,330	74.3	+2.2
	Conservative	Ronald J. Maddocks	5,182	14.6	−2.3
	Plaid Cymru	John D. A. Howell	3,949	11.1	+0.1
Majority			21,148	59.7	+4.5
Turnout			35,461	76.8	−1.6
Registered electors			46,180
	Labour hold		Swing

1968 Caerphilly by-election^[9][8]

Party		Candidate	Votes	%	±%
	Labour	Alfred Evans	16,148	45.7	−28.6
	Plaid Cymru	Phil Williams	14,274	40.4	+29.3
	Conservative	Robert Williams	3,687	10.4	−4.2
	Liberal	Peter Sadler	1,257	3.5	N/A
Majority			1,874	5.3	−54.4
Turnout			35,366	75.9	−0.9
Registered electors			46,578
	Labour hold		Swing

Elections in the 1970s

General election 1970: Caerphilly^[8]

Party		Candidate	Votes	%	±%
	Labour	Alfred Evans	24,972	61.8	−12.5
	Plaid Cymru	Phil Williams	11,505	28.5	+17.4
	Conservative	Peter Price	3,917	9.7	−4.9
Majority			13,467	33.3	−26.4
Turnout			40,394	78.1	+1.3
Registered electors			51,741
	Labour hold		Swing

General election February 1974: Caerphilly^[10]

Party		Candidate	Votes	%	±%
	Labour	Alfred Evans	24,838	57.2	−4.6
	Plaid Cymru	Phil Williams	11,956	27.5	−1.0
	Conservative	Roger Everest	5,912	13.6	+3.9
	Independent	D H Bevan	711	1.6	N/A
Majority			12,882	29.7	−3.6
Turnout			40,394	77.5	−0.6
Registered electors			56,013
	Labour hold		Swing

General election October 1974: Caerphilly^[11]

Party		Candidate	Votes	%	±%
	Labour	Alfred Evans	24,161	56.6	−0.6
	Plaid Cymru	Phil Williams	10,452	24.5	−3.0
	Conservative	Den Dover	4,897	11.5	−2.1
	Liberal	N H Lewis	3,184	7.4	N/A
Majority			13,709	32.1	+2.4
Turnout			42,694	75.6	−1.9
Registered electors			56,462
	Labour hold		Swing

General election 1979: Caerphilly^[12]

Party		Candidate	Votes	%	±%
	Labour	Ednyfed Davies	27,280	58.8	+2.2
	Conservative	John Ranelagh	8,783	18.9	+7.4
	Plaid Cymru	Phil Williams	6,931	15.0	−9.5
	Liberal	N Jones	3,430	7.3	−0.1
Majority			18,497	39.9	+7.8
Turnout			46,424	78.8	+3.2
Registered electors			58,908
	Labour hold		Swing

Elections in the 1980s

General election 1983: Caerphilly^[13]

Party		Candidate	Votes	%	±%
	Labour	Ron Davies	21,570	45.6	−13.2
	Liberal	Anthony Lambert	10,017	21.2	+13.9
	Conservative	Charles Welby	9,295	19.6	+0.7
	Plaid Cymru	Lindsay Whittle	6,414	13.6	−1.4
Majority			11,553	24.4	−15.5
Turnout			47,296	74.5	−4.3
Registered electors			63,479
	Labour hold		Swing

General election 1987: Caerphilly^[14]

Party		Candidate	Votes	%	±%
	Labour	Ron Davies	28,698	58.4	+12.8
	Conservative	Michael Powell	9,531	19.4	−0.2
	Liberal	Michael Butlin	6,923	14.1	−7.1
	Plaid Cymru	Lindsay Whittle	3,955	8.1	−5.5
Majority			19,167	39.0	+14.6
Turnout			49,107	76.6	+2.1
Registered electors			64,154
	Labour hold		Swing

Elections in the 1990s

General election 1992: Caerphilly^[15][16]

Party		Candidate	Votes	%	±%
	Labour	Ron Davies	31,713	63.7	+5.3
	Conservative	Howard L. Philpott	9,041	18.1	−1.3
	Plaid Cymru	Lindsay Whittle	4,821	9.7	+1.6
	Liberal Democrats	Stan W. Wilson	4,247	8.5	−5.6
Majority			22,672	45.6	+6.6
Turnout			49,822	77.2	+0.6
Registered electors			64,529
	Labour hold		Swing	+3.2

General election 1997: Caerphilly^[17][18]

Party		Candidate	Votes	%	±%
	Labour	Ron Davies	30,697	67.3	+3.6
	Conservative	Rhodri Harris	4,858	10.7	−7.4
	Plaid Cymru	Lindsay Whittle	4,383	9.7	±0.0
	Liberal Democrats	Tony D. Ferguson	3,724	8.2	−0.3
	Referendum	Mark E. Morgan	1,337	3.0	N/A
	ProLife Alliance	Catherine Williams	270	0.6	N/A
Majority			25,839	56.6	+11.0
Turnout			45,269	70.1	−7.1
Registered electors			64,621
	Labour hold		Swing	+5.5

Elections in the 2000s

General election 2001: Caerphilly^[19][20]

Party		Candidate	Votes	%	±%
	Labour	Wayne David	22,597	58.2	−9.1
	Plaid Cymru	Lindsay Whittle	8,172	21.0	+11.3
	Conservative	David Simmonds	4,415	11.4	+0.7
	Liberal Democrats	Rob Roffe	3,649	9.4	+1.2
Majority			14,425	37.2	−18.4
Turnout			38,833	57.7	−12.4
Registered electors			67,300
	Labour hold		Swing	-10.5

General election 2005: Caerphilly^[21][22]

Party		Candidate	Votes	%	±%
	Labour	Wayne David	22,190	56.6	−1.6
	Plaid Cymru	Lindsay Whittle	6,831	17.4	−3.6
	Conservative	Stephen Watson	5,711	14.6	+3.2
	Liberal Democrats	Ashgar Ali	3,861	9.8	+0.4
	Forward Wales	Rachel Ball	636	1.6	N/A
Majority			15,359	39.2	+2.0
Turnout			39,229	58.6	+0.9
Registered electors			66,162
	Labour hold		Swing	+1.0

Elections in the 2010s

General election 2010: Caerphilly^[23][24]

Party		Candidate	Votes	%	±%
	Labour	Wayne David	17,377	44.9	−10.5
	Conservative	Maria Caulfield	6,622	17.1	+2.4
	Plaid Cymru	Lindsay Whittle	6,460	16.7	−1.4
	Liberal Democrats	Kay David	5,688	14.7	+4.7
	BNP	Laurence Reid	1,635	4.2	N/A
	UKIP	Tony Jenkins	910	2.4	N/A
Majority			10,755	27.8	−11.4
Turnout			38,692	62.3	+3.7
Registered electors			62,122
	Labour hold		Swing	−6.5

General election 2015: Caerphilly^[25][26][27]

Party		Candidate	Votes	%	±%
	Labour	Wayne David[28]	17,864	44.3	−0.6
	UKIP	Sam Gould[29]	7,791	19.3	+16.9
	Conservative	Leo Docherty[28]	6,683	16.6	−0.5
	Plaid Cymru	Beci Newton[28]	5,895	14.6	−2.1
	Green	Katy Beddoe[30]	937	2.3	N/A
	Liberal Democrats	Aladdin Ayesh	935	2.3	−12.4
	TUSC	Rachel Ball	178	0.4	N/A
Rejected ballots			81
Majority			10,073	25.0	−2.8
Turnout			40,283	63.3	+1.0
Registered electors			63,603
	Labour hold		Swing	−8.7

Of the 81 rejected ballots:

• 59 were either unmarked or it was uncertain who the vote was for.^[26]
• 22 voted for more than one candidate.^[26]

General election 2017: Caerphilly^[31][32]

Party		Candidate	Votes	%	±%
	Labour	Wayne David	22,491	54.5	+10.2
	Conservative	Jane Pratt	10,413	25.2	+8.6
	Plaid Cymru	Lindsay Whittle	5,962	14.4	−0.2
	UKIP	Liz Wilks	1,259	3.0	−16.3
	Liberal Democrats	Kay David	725	1.8	−0.5
	Green	Andrew Creak	447	1.1	−1.2
Majority			12,078	29.3	+4.3
Turnout			41,297	64.1	+0.8
Registered electors			64,381
	Labour hold		Swing	+0.7

General election 2019: Caerphilly^[33][34]

Party		Candidate	Votes	%	±%
	Labour	Wayne David	18,018	44.9	−9.6
	Conservative	Jane Pratt	11,185	27.9	+2.7
	Plaid Cymru	Lindsay Whittle	6,424	16.0	+1.6
	Brexit Party	Nathan Gill	4,490	11.2	N/A
Rejected ballots			160
Majority			6,833	17.0	−12.3
Turnout			40,117	65.3	−2.8
Registered electors			63,166
	Labour hold		Swing	−6.1

Of the 160 rejected ballots:

• 132 were either unmarked or it was uncertain who the vote was for.^[34]
• 28 voted for more than one candidate.^[34]

2019 notional result [n 3] [35]
Party		Vote	%
	Labour	19,763	43.9
	Conservative	12,882	28.6
	Plaid Cymru	6,630	14.7
	Brexit Party	5,287	11.7
	Liberal Democrats	323	0.7
	Green Party	164	0.4
Majority		6,901	15.3
Turnout		45,069	62.2
Electorate		72,458

Elections in the 2020s

General election 2024: Caerphilly^[36]

Party		Candidate	Votes	%	±%
	Labour Co-op	Chris Evans	14,538	38.0	−5.9
	Plaid Cymru	Lindsay Whittle	8,119	21.2	+6.5
	Reform UK	Joshua Seungkyun Kim	7,754	20.3	+8.6
	Conservative	Brandon Gorman	4,385	11.5	−17.1
	Liberal Democrats	Steve Aicheler	1,788	4.7	+4.0
	Green	Mark Thomas	1,650	4.3	+3.9
Majority			6,419	16.8
Turnout			38,234	52.7	−9.6
Registered electors			72,643
	Labour hold		Swing	−6.2

Of the 156 rejected ballots:

• 127 were either unmarked or it was uncertain who the vote was for.^[37]
• 28 voted for more than one candidate.^[37]
• 1 had writing or a mark by which the voter could be identified.^[37]

See also

• Caerphilly (Senedd constituency)
• List of parliamentary constituencies in Gwent
• List of UK Parliament constituencies in Wales

Notes

1. A borough constituency (for the purposes of election expenses and type of returning officer)
2. As with all constituencies, the constituency elects one Member of Parliament (MP) by the first past the post system of election at least every five years.
3. Estimate of the 2019 general election result as if the revised boundaries recommended under the 2023 boundary review were in place