Riding profile

Merthyr Tydfil and Aberdare

UK constituency — Wales · Mixed · wales

The question

Merthyr Tydfil and Aberdare: who wins this toss-up?

Current forecast

Reform UK

Toss-up

Probability
86%
Mean margin (pts)
1.2
P(close race)
100%

Projected vote share

Projection by party

  • Reform UK 27.7%
  • Plaid Cymru 26.7%
  • Labour 23.9%
  • Green 8.7%
  • Conservative 5.9%
  • Other 3.8%
  • Lib Dems 3.0%

Watch list

The tightest races

Smallest projected margin. Open one for the numbers.

  1. Birmingham ErdingtonReform UK60 %0.5 pt margin
  2. Derby NorthLabour62 %0.5 pt margin
  3. Middlesbrough and Thornaby EastReform UK62 %0.5 pt margin

In context

How this riding stacks up

Reform UK Plaid Cymru Labour Green
HereMerthyr Tydfil and Aberdare 27.7%26.7%23.9%8.7%
National averageUnited Kingdom 25.4% +2.3 1.2% +25.5 21.8% +2.1 10.8% −2.1

Nationwide averages computed across the 650 riding-level projections (unweighted mean).

Editorial read

Merthyr Tydfil and Aberdare, a mixed constituency in Wales, elected a member with Labour in the previous cycle, with a 21-point margin. The Vote-Scope model projects Reform UK ahead at 28% vote share, against 27% for Plaid Cymru, and the race could swing.

Sitting member

Gerald Jones

Sits with Labour

Since
2015-05-07
Parliament
59th

Previous election · 2024

Won by
Labour
Margin
21.1 pts
Margin shift vs current projection
-20.0 pts

Detailed result · UK 2024

Candidates and votes

Candidate Party Votes % Occupation
Gerald Jones Elected Labour 15,791 44.8
Gareth Thomas Reform UK 8,344 23.7
Francis Whitefoot Plaid Cymru 4,768 13.5
Amanda Jenner Conservative 2,687 7.6
Jade Smith Lib Dems 1,276 3.6
Peter Griffin Green 1,231 3.5
Anthony Cole Other 531 1.5
Lorezo De Gregori Other 375 1.1
Bob Davenport Other 212 0.6

Demographics

Who lives here

Population
99,698
Median age
41
Employment rate
69.3%

Data source : ONS mid-2022 population + Jan 2026 labour market

Last model run
Cycle
uk_2029