Alyn and Deeside
Wales · County constituency · Flintshire borough
About the Alyn and Deeside constituency
Alyn and Deeside is a county constituency in Wales, covering most or all of Flintshire. The sitting MP is Sir Mark Tami (Labour), first elected in June 2001.
At the 2024 general election, Labour won Alyn and Deeside with 42.4% of the vote, ahead of Reform UK on 22.1%, a majority of 8,794 votes. Turnout was 57.3%.
If a general election were held today, PollCheck's projection at the current seven-poll average has Reform UK on 31.1% and Labour on 22.7% in Alyn and Deeside, a margin of 8.4 points, a projected change from Labour since 2024. The projection updates automatically as new polls are added.
Demographically, Alyn and Deeside is a Leave-leaning area (an estimated 58.0% voted Leave in 2016). About 27.4% of residents hold a degree, 70.7% of homes are owner-occupied, and the seat has a median age of about 43 (2021 Census).
Across the most recent general elections on record here, the seat has been won by Labour each time.
Who lives in Alyn and Deeside? Constituency demographics
From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.
How did Alyn and Deeside 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 Alyn and Deeside
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 Alyn and Deeside voted at the Senedd election (7 May 2026)
Alyn and Deeside sits almost entirely within the Senedd constituency of Fflint Wrecsam. Senedd elections use a closed-list proportional system; each Senedd seat returns six members.
| Senedd constituency | Share of Alyn and Deeside | Winner | Runner-up | Seats (6 per constituency) |
|---|---|---|---|---|
| Fflint Wrecsam | 98% | Reform UK 36.2% | Plaid Cymru 26.3% | 2 Reform UK, 2 Plaid Cymru, 1 Conservative, 1 Labour |
Senedd 2026 results from official declarations. Overlap percentages are area-based using the post-2024 Westminster boundary against the new 16-seat Senedd boundary.
Alyn and Deeside within Flintshire
The Westminster constituency of Alyn and Deeside sits entirely within Flintshire Council. Local council elections are a separate ballot from Westminster general elections - English councils rotate their election cycles and Flintshire was not due to vote in 2026, so the figures below show the most recent council ward results available.
Council overlap
| Council | Share of seat |
|---|---|
| Flintshire | 100% |
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 Alyn and Deeside at each of the last 60 GB polls. Hover the chart for the underlying poll details.
Who has won Alyn and Deeside 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 |
|---|---|---|---|---|---|---|---|
| 2010 | Lab hold | Mark Tami | 39.6% | 32.3% | 18.3% | 2,919 | 65.5% |
| 2015 | Lab hold | Mark Tami | 40.0% | 31.9% | 4.2% | 3,343 | 66.6%+1.1 |
| 2017 | Lab hold | Mark Tami | 52.1% | 40.4% | 2.4% | 5,235 | 71.0%+4.4 |
| 2019notional | Labour winner | Mark Tami 2019 MP, pre-review boundary | 42.7% | 42.0% | 5.9% | 411 | 69.2%-1.8 |
| 2024 | Lab hold | Mark Tami | 42.4% | 18.2% | 4.8% | 8,794 | 57.3%-11.9 |
Earlier years are on pre-2024 boundaries; comparable results on the new boundary will be added when sourced.
Constituencies most like Alyn and Deeside
Five seats with similar demographic profiles to Alyn and Deeside. Politics shown for context.
- ↑Owner-occupied70.7 / 71.4vs 61.9
- ↓Private rent13.8 / 13.7vs 20.2
- ↑Leave58.0 / 60.7vs 53.2
- ↑Owner-occupied70.7 / 69.8vs 61.9
- ↓Private rent13.8 / 12.8vs 20.2
- ↑Leave58.0 / 58.7vs 53.2
- ↑Owner-occupied70.7 / 71.2vs 61.9
- ↓Graduate27.4 / 26.3vs 33.7
- ↓Private rent13.8 / 14.7vs 20.2
- ↑Owner-occupied70.7 / 69.1vs 61.9
- ↓Graduate27.4 / 25.9vs 33.7
- ↓Private rent13.8 / 15.2vs 20.2
- ↑Owner-occupied70.7 / 73.4vs 61.9
- ↓Private rent13.8 / 12.9vs 20.2
- ↑Leave58.0 / 57.2vs 53.2
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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