Who is the MP for St Helens South and Whiston?

Ms Marie Rimmer (Labour) is the MP for St Helens South and Whiston. They were first elected in May 2015.

Who won St Helens South and Whiston at the 2024 general election?

The 2024 general election in St Helens South and Whiston was won by Labour with 49.7% of the vote, ahead of Reform UK on 18.3%.

Who is projected to win the next election in St Helens South and Whiston?

PollCheck's current projection has Reform UK on 39.3% and Labour on 26.1% if a general election were held today. The projection updates as new polling is added.

What council is St Helens South and Whiston in?

St Helens South and Whiston crosses multiple council boundaries: St. Helens (87%), Knowsley (13%). Westminster constituencies and local councils are separate units.

What is the demographic profile of St Helens South and Whiston?

St Helens South and Whiston is in North West. The seat is Leave-voting (Leave vote estimated at 56.0% in 2016). Around 27.2% of residents have a degree, a median age of 43, and 62.8% of homes are owner-occupied (Census 2021).

When was the last general election in St Helens South and Whiston?

The most recent general election was held on 4 July 2024. In St Helens South and Whiston, Labour won with 49.7% of the vote. The next general election must be held by August 2029.

Which parties have won St Helens South and Whiston in recent elections?

Recent general election winners in St Helens South and Whiston: 2010 Labour, 2015 Labour, 2017 Labour, 2019 Labour, 2024 Labour.

Constituency profile

St Helens South and Whiston

North West · Borough constituency

Sitting MP

Ms Marie Rimmer

Labour

First elected May 2015

Current PollCheck projection

Region & type

North West

Borough constituency

Last 5 GE winners

LLLLL

Labour 5/5

EU referendum 2016

56.0% Leave

UK average 51.9%; +4.1pp above mean

Current outlook

Reform UK +13.2pp

Vulnerability score 6/10 (Labour projected to lose)

NorthernLeave-leaningWorking-class profile

Who lives in St Helens South and Whiston? Constituency demographics

From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.

Leave vote 2016

56.0%

UK average ~52%

Degree or above

27.2%

UK average ~34%

No qualifications

21.7%

UK average ~18%

Owner-occupied

62.8%

UK average ~63%

Renting (social + private)

36.3%

UK average ~36%

Median age

42.8

UK median ~40

Age 65+

23.6%

UK average ~19%

Age 18-34

28.5%

UK average ~28%

How did St Helens South and Whiston 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

Lab hold · majority 11,945 votes (31.4pp) · turnout 53.1%

Current projection

If a general election were held today, at current poll average

Map of St Helens South and Whiston

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.

Council layer (not Westminster)

St Helens South and Whiston within St. Helens and Knowsley

St Helens South and Whiston crosses multiple council boundaries: St. Helens (87%), Knowsley (13%). The figures below come from the council elections held on Thursday 7 May 2026 in each constituent council.

Council overlap

Council	Share of seat	Projection
St. Helens 55 LSOAs	87%	View projection ›
Knowsley 8 LSOAs	13%	View projection ›

Most recent council ward results

Latest council winner per ward. Where May 2026 elections happened, those are shown; otherwise the most recent year on the ward’s pre-2026 boundary (via DCLEAPIL, 2014-2024). 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.

Loading ward results...

Ward	GE2024 winner	Latest council winner	Shift since GE2024	Turnout

Projection trajectory

PollCheck's projection for St Helens South and Whiston at each of the last 60 GB polls. Hover the chart for the underlying poll details.

Who has won St Helens South and Whiston 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	Right (Ref/UKIP)	Green	Other	Majority	Turnout
2010	Lab hold	Shaun Woodward	52.9%	17.8%	22.2%	2.7% UKIP	-	4.4%	14,122	59.1%
2015	Lab hold	Marie Rimmer	59.8%	15.9%	5.7%	14.0% UKIP	4.6%	-	21,243	62.3%
2017	Lab hold	Marie Rimmer	67.8%	21.8%	4.0%	3.7% UKIP	2.7%	-	24,343	66.9%
2019notional	Labour winner	Marie Rimmer 2019 MP, pre-review boundary	58.1%	21.3%	5.7%	-	4.3%	10.6%	16,720	64.0%
2024	Lab hold	Marie Rimmer	49.7%	8.0%	5.8%	18.3% Ref	6.9%	11.2%	11,945	53.1%

Earlier years are on pre-2024 boundaries; comparable results on the new boundary will be added when sourced.

Constituencies most like St Helens South and Whiston

Five seats with similar demographic profiles to St Helens South and Whiston. Politics shown for context.

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.

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.

If you spot a data issue, please let us know.