Brecon, Radnor and Cwm Tawe
Wales · County constituency
About the Brecon, Radnor and Cwm Tawe constituency
Brecon, Radnor and Cwm Tawe is a county constituency in Wales, spanning parts of Powys, Neath Port Talbot and neighbouring councils. The sitting MP is David Chadwick (Liberal Democrat), first elected in July 2024.
At the 2024 general election, the Liberal Democrats won Brecon, Radnor and Cwm Tawe with 29.5% of the vote, ahead of the Conservatives on 26.4%, a majority of 1,472 votes. Turnout was 63.7%.
If a general election were held today, PollCheck's projection at the current seven-poll average has the Liberal Democrats on 27.4% and Reform UK on 22.2% in Brecon, Radnor and Cwm Tawe, a margin of 5.2 points. The projection updates automatically as new polls are added.
Demographically, Brecon, Radnor and Cwm Tawe is closely divided in the 2016 EU referendum (an estimated 52.9% voted Leave in 2016). About 32.2% of residents hold a degree, 69.0% of homes are owner-occupied, and the seat has a median age of about 50 (2021 Census).
Across the last 5 general elections on record, the seat has been won by the Conservatives 3 times, the Liberal Democrats 2 times (earlier years may be on predecessor boundaries).
Who lives in Brecon, Radnor and Cwm Tawe? Constituency demographics
From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.
How did Brecon, Radnor and Cwm Tawe vote in 2024 and how would it vote now?
2024 vote shares from the HoC Library. Current projection is at the 7-poll average.
2024 general election
Current projection
Map of Brecon, Radnor and Cwm Tawe
Switch between ward-level 2024 election winners and a demographic view. Ward winners are Britain Elects' / New Statesman modelled estimates with an average ~4pp margin of error per ward. The demographic view splits the seat into small neighbourhoods (around 1,500 residents each, from the 2021 Census). Hover any area for detail.
How Brecon, Radnor and Cwm Tawe voted at the Senedd election (7 May 2026)
Brecon, Radnor and Cwm Tawe sits entirely within the Senedd constituency of Brycheiniog Tawe Nedd. Senedd elections use a closed-list proportional system; each Senedd seat returns six members.
| Senedd constituency | Share of Brecon, Radnor and Cwm Tawe | Winner | Runner-up | Seats (6 per constituency) |
|---|---|---|---|---|
| Brycheiniog Tawe Nedd | 100% | Reform UK 33.2% | Plaid Cymru 28.7% | 3 Reform UK, 2 Plaid Cymru, 1 Liberal Democrats |
Senedd 2026 results from official declarations. Overlap percentages are area-based using the post-2024 Westminster boundary against the new 16-seat Senedd boundary.
Brecon, Radnor and Cwm Tawe within Powys and Neath Port Talbot
Brecon, Radnor and Cwm Tawe crosses multiple council boundaries: Powys (76%), Neath Port Talbot (24%). English councils rotate their election cycles and none of the constituent councils were due to vote in 2026, so the figures below show the most recent ward result available for each ward.
Council overlap
| Council | Share of seat |
|---|---|
| Powys | 76% |
| Neath Port Talbot | 24% |
Recent council by-elections
Council ward by-elections held inside this seat, most recent first. The result column shows which party won; the share column shows the top three parties’ vote shares on the day.
| Date | Ward | Result | Top 3 vote shares |
|---|---|---|---|
| 4 Apr 2025 | Cwmllynfell and Ystalyfera | LD GAIN from Lab | — |
| 16 Feb 2024 | Rhos | Ind GAIN from PC | — |
| 1 Dec 2023 | Talybont-on-Usk | LD HOLD | — |
| 17 Nov 2023 | Crickhowell with Cwmdu and Tretower | LD GAIN from Ind | — |
Most recent council ward results
Latest council winner per ward. Where the council held a May 2026 election, those results are shown; otherwise we show the most recent available ward result (via DCLEAPIL, 2014-2024), or, where the seat was uncontested at the last election, the current sitting councillor from OpenCouncilData. The "Shift since GE2024" column is only computed for May 2026 results - earlier council votes pre-date the GE, so no directional shift is shown.
| Ward | GE2024 winner | Latest council winner | Shift since GE2024 | Turnout |
|---|
Projection trajectory
PollCheck's projection for Brecon, Radnor and Cwm Tawe at each of the last 60 GB polls. Hover the chart for the underlying poll details.
Who has won Brecon, Radnor and Cwm Tawe at past general elections?
2024 result is on current boundaries. The 2019 row is the UK Parliament's notional recalculation onto the 2024 boundaries (directly comparable to 2024). The 2010, 2015 and 2017 rows are on the boundaries in force at the time and aren't directly comparable.
| Year | Result | MP | Lab | Con | LD | Majority | Turnout |
|---|---|---|---|---|---|---|---|
| 2010predecessor | LD hold | Roger Williams Brecon and Radnorshire MP | 10.5% | 36.5% | 46.2% | 3,747 | 72.5% |
| 2015predecessor | Con gain from LD | Chris Davies Brecon and Radnorshire MP | 14.7% | 41.1% | 28.3% | 5,102 | 73.6%+1.1 |
| 2017predecessor | Con hold | Chris Davies Brecon and Radnorshire MP | 17.7% | 48.6% | 29.1% | 8,038 | 73.8%+0.2 |
| 2019notional | Conservative winner | Fay Jones Brecon and Radnorshire MP, pre-review boundary | 17.5% | 46.6% | 29.2% | 9,091 | 72.5% |
| 2024 | LD gain from Con | David Chadwick | 21.3% | 26.3% | 29.5% | 1,472 | 63.7%-8.8 |
Brecon, Radnor and Cwm Tawe was created or substantially redrawn by the 2023 boundary review. Pre-2024 rows below are for the predecessor seat Brecon and Radnorshire (the seat that covered most of this area), so vote shares and majorities aren’t directly comparable to the post-2024 figures.
Constituencies most like Brecon, Radnor and Cwm Tawe
Five seats with similar demographic profiles to Brecon, Radnor and Cwm Tawe. Politics shown for context.
- ↑Age 65+32.1 / 31.5vs 22.7
- ↓Under 3522.6 / 23.3vs 30.2
- ↑Owner-occupied69.0 / 68.2vs 61.9
- ↑Age 65+32.1 / 30.6vs 22.7
- ↑Owner-occupied69.0 / 71.7vs 61.9
- ↓Under 3522.6 / 23.6vs 30.2
- ↑Age 65+32.1 / 31.1vs 22.7
- ↑Owner-occupied69.0 / 69.3vs 61.9
- ↓Under 3522.6 / 23.9vs 30.2
- ↑Age 65+32.1 / 31.3vs 22.7
- ↓Under 3522.6 / 22.7vs 30.2
- ↑Owner-occupied69.0 / 71.0vs 61.9
- ↑Age 65+32.1 / 34.5vs 22.7
- ↓Under 3522.6 / 21.3vs 30.2
- ↑Owner-occupied69.0 / 69.2vs 61.9
What would change this seat?
Move the sliders to set national vote shares. The per-seat projection updates live. Reset returns to the current 7-poll average.
Related
Sources
- 2024 general election results · UK Parliament Election Results portal and House of Commons Library briefing CBP-10009.
- Notional 2019 results on 2024 boundaries · UK Parliament Election Results portal. Recalculated by Parliament; carries assumptions about how 2019 voters would have distributed across the redrawn boundaries.
- Historic general election results (2010-2017) · House of Commons Library historic results files (on the boundaries in force at the time).
- Ward-level GE2024 estimates · Britain Elects / New Statesman - article by Ben Walker, underlying spreadsheet. Modelled from constituency totals; average ~4pp per-ward MoE.
- May 2026 council ward results · Democracy Club via PollCheck's locals 2026 dataset.
- Earlier council ward results (2014-2024) · DCLEAPIL v1.0 (Jason Leman, drawing on Andrew Teale's LEAP dataset and Democracy Club).
- Demographics · ONS Census 2021 (England and Wales), aggregated to constituency level using the ONS LSOA21 -> PCON24 best-fit lookup.
- EU referendum 2016 estimates · Constituency-level Leave vote estimates (Hanretty 2017 method).
- MP details and Cabinet roles · UK Parliament Members API. MP photos are fetched live from the same source.
- Boundary geometry and lookups · ONS Open Geography Portal (PCON24 boundaries, LSOA21 boundaries, LSOA21-WD24-LAD24 best-fit lookup).
- Current projection and trajectory · PollCheck's demographic swingometer applied to the rolling 7-poll average from aggregated GB polls. Not a true MRP - vote-share movements are applied through per-constituency sensitivity multipliers derived from demographic regressions.
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