Who is the MP for Great Grimsby and Cleethorpes?

Melanie Onn (Labour) is the MP for Great Grimsby and Cleethorpes. They were first elected in July 2024.

Who won Great Grimsby and Cleethorpes at the 2024 general election?

The 2024 general election in Great Grimsby and Cleethorpes was won by Labour with 41.9% of the vote, ahead of Reform UK on 28.8%.

Who is projected to win the next election in Great Grimsby and Cleethorpes?

PollCheck's current projection has Reform UK on 46.9% and Conservative on 18.0% if a general election were held today. The projection updates as new polling is added.

What council is Great Grimsby and Cleethorpes in?

Great Grimsby and Cleethorpes sits within North East Lincolnshire council. Westminster constituencies and local councils are separate units, but North East Lincolnshire covers most or all of the Great Grimsby and Cleethorpes area.

What is the demographic profile of Great Grimsby and Cleethorpes?

Great Grimsby and Cleethorpes is in Yorkshire and The Humber. The seat is Leave-voting (Leave vote estimated at 70.5% in 2016). Around 19.6% of residents have a degree, a median age of 41, and 56.9% of homes are owner-occupied (Census 2021).

When was the last general election in Great Grimsby and Cleethorpes?

The most recent general election was held on 4 July 2024. In Great Grimsby and Cleethorpes, Labour won with 41.9% of the vote. The next general election must be held by August 2029.

Which parties have won Great Grimsby and Cleethorpes in recent elections?

Recent general election winners in Great Grimsby and Cleethorpes: 2010 Labour, 2015 Labour, 2017 Labour, 2019 Conservative, 2024 Labour.

Constituency profile

Great Grimsby and Cleethorpes

Yorkshire and The Humber · Borough constituency · North East Lincolnshire borough

Sitting MP

Melanie Onn

Labour

First elected July 2024

Current PollCheck projection

Region & type

Yorkshire and The Humber

Borough constituency, North East Lincolnshire council

Last 5 GE winners

LLLCL

Labour 4/5, Conservative 1/5

EU referendum 2016

70.5% Leave

UK average 51.9%; +18.6pp above mean

Current outlook

Reform UK +28.9pp

Vulnerability score 10/10 (Labour projected to lose)

NorthernStrong Leave areaWorking-class profile

Who lives in Great Grimsby and Cleethorpes? Constituency demographics

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

Leave vote 2016

70.5%

UK average ~52%

Degree or above

19.6%

UK average ~34%

No qualifications

26.2%

UK average ~18%

Owner-occupied

56.9%

UK average ~63%

Renting (social + private)

42.6%

UK average ~36%

Median age

40.7

UK median ~40

Age 65+

23.1%

UK average ~19%

Age 18-34

30.1%

UK average ~28%

How did Great Grimsby and Cleethorpes 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 gain from Con · majority 4,803 votes (13.1pp) · turnout 48.1%

Current projection

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

Map of Great Grimsby and Cleethorpes

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)

Great Grimsby and Cleethorpes within North East Lincolnshire

The Westminster constituency of Great Grimsby and Cleethorpes sits entirely within North East Lincolnshire Council. Local council elections are a separate ballot from Westminster general elections - the figures below are from the council elections held on Thursday 7 May 2026.

Council overlap

Council	Share of seat	Projection
North East Lincolnshire 75 LSOAs	100%	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 Great Grimsby and Cleethorpes at each of the last 60 GB polls. Hover the chart for the underlying poll details.

Who has won Great Grimsby and Cleethorpes 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
2010predecessor	Lab hold	Austin Mitchell Great Grimsby MP	32.7%	30.5%	22.4%	6.2% UKIP	-	8.1%	714	53.8%
2015predecessor	Lab hold	Melanie Onn Great Grimsby MP	39.8%	26.3%	5.0%	25.0% UKIP	2.3%	1.7%	4,540	57.0%
2017predecessor	Lab hold	Melanie Onn Great Grimsby MP	49.4%	42.2%	2.7%	4.6% UKIP	-	1.1%	2,565	57.5%
2019notional	Conservative winner	Lia Nici Great Grimsby MP, pre-review boundary	32.2%	55.6%	4.9%	-	2.0%	5.3%	9,759	54.1%
2024	Lab gain from Con	Melanie Onn	41.9%	22.6%	2.8%	28.8% Ref	3.0%	0.9%	4,803	48.1%

Great Grimsby and Cleethorpes was created or substantially redrawn by the 2023 boundary review. Pre-2024 rows below are for the predecessor seat Great Grimsby (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 Great Grimsby and Cleethorpes

Five seats with similar demographic profiles to Great Grimsby and Cleethorpes. 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.