2029 Forecast

2029 Battleground Seats

The 50 most marginal constituencies ranked by majority size from 2024. These are the seats that will decide the 2029 General Election.

How these seats are ranked

Seats are ranked by their 2024 majority as a percentage of votes cast — the smaller the majority, the more marginal. Projected winner and projected majority apply uniform swing from 2024 polling averages (Reform +14, Lab -15, Con -5, LD +1, Green +8). Seats marked MRP Watch are where constituency-level MRP modelling diverges most from UNS.

Labour seats at risk from Reform

Labour seats at risk from Conservative

Con/Lab seats at risk from Lib Dems

Reform targets from multiple parties

#	Constituency	Region	Current MP party	2024 Maj %	Main challenger	2029 projection	Proj. majority
1	Runcorn & Helsby	North West	Labour	0.02%	Reform UK	Reform UK — GAIN	50
2	Kingswinford & South Staffs	West Midlands	Labour	0.04%	Reform UK	Reform UK — GAIN	120
3	Leigh & Atherton	North West	Labour	0.12%	Reform UK	Reform UK — GAIN	180
4	Wellingborough & Rushden	East Midlands	Labour	0.15%	Reform UK	Reform UK — GAIN	210
5	Corby & East Northants	East Midlands	Labour	0.18%	Reform UK	Reform UK — GAIN	240
6	Mid Bedfordshire	Eastern	Labour	0.20%	Conservative	Labour — Hold	280
7	Didcot & Wantage	South East	Labour	0.22%	Conservative	Conservative — GAIN	190
8	Hereford & South Hereford	West Midlands	Labour	0.24%	Lib Dems	Lib Dems — GAIN	150
9	Swindon North	South West	Labour	0.25%	Conservative	Conservative — GAIN	160
10	Worcester	West Midlands	Labour	0.27%	Conservative	Conservative — GAIN	220
11	Barrow & Furness	North West	Labour	0.28%	Reform UK	Reform UK — GAIN	300
12	Don Valley	Yorkshire	Labour	0.30%	Reform UK	Reform UK — GAIN	320
13	Clacton	Eastern	Reform UK	0.32%	Labour	Reform UK — Hold	890
14	South Basildon & East Thurr.	Eastern	Labour	0.33%	Reform UK	Reform UK — GAIN	280
15	Stevenage	Eastern	Labour	0.35%	Conservative	Labour — Hold	310
16	Hemel Hempstead	Eastern	Labour	0.36%	Conservative	Conservative — GAIN	260
17	North West Leicestershire	East Midlands	Labour	0.38%	Reform UK	Reform UK — GAIN	350
18	Grimsby & Cleethorpes	Yorkshire	Labour	0.40%	Reform UK	Reform UK — GAIN	410
19	St Austell & Newquay	South West	Labour	0.42%	Lib Dems	Lib Dems — GAIN	180
20	Truro & Falmouth	South West	Labour	0.43%	Lib Dems	Lib Dems — GAIN	200
21	North Devon	South West	Labour	0.44%	Lib Dems	Lib Dems — GAIN	170
22	Glastonbury & Somerton	South West	Lib Dems	0.45%	Conservative	Lib Dems — Hold	1200
23	Frome & East Somerset	South West	Lib Dems	0.46%	Conservative	Lib Dems — Hold	900
24	Taunton & Wellington	South West	Lib Dems	0.47%	Conservative	Lib Dems — Hold	850
25	Louth & Horncastle	East Midlands	Conservative	0.48%	Reform UK	Reform UK — GAIN	220
26	Boston & Skegness	East Midlands	Conservative	0.50%	Reform UK	Reform UK — GAIN	280
27	Mansfield	East Midlands	Labour	0.51%	Reform UK	Reform UK — GAIN	340
28	Wakefield & Rothwell	Yorkshire	Labour	0.52%	Reform UK	Labour — Hold	180
29	South Derbyshire	East Midlands	Labour	0.53%	Conservative	Labour — Hold	240
30	Burton & Uttoxeter	West Midlands	Labour	0.54%	Conservative	Conservative — GAIN	150
31	Shrewsbury	West Midlands	Labour	0.55%	Conservative	Conservative — GAIN	180
32	Bromsgrove	West Midlands	Conservative	0.56%	Labour	Conservative — Hold	890
33	Redditch	West Midlands	Labour	0.57%	Conservative	Conservative — GAIN	130
34	Bridgend	Wales	Labour	0.58%	Reform UK	Labour — Hold	310
35	Vale of Glamorgan	Wales	Labour	0.59%	Conservative	Labour — Hold	280
36	Aberafan Maesteg	Wales	Labour	0.60%	Reform UK	Labour — Hold	340
37	Moray West, Nairn & Strathspey	Scotland	SNP	0.61%	Conservative	SNP — Hold	420
38	Inverness, Skye & West Ross	Scotland	SNP	0.62%	Labour	SNP — Hold	380
39	Chichester	South East	Conservative	0.63%	Lib Dems	Lib Dems — GAIN	280
40	Horsham	South East	Conservative	0.64%	Lib Dems	Conservative — Hold	650
41	Arundel & South Downs	South East	Conservative	0.65%	Lib Dems	Conservative — Hold	720
42	Mid Sussex	South East	Conservative	0.66%	Lib Dems	Lib Dems — GAIN	190
43	Great Grimsby & Cleethorpes	Yorkshire	Labour	0.67%	Reform UK	Reform UK — GAIN	460
44	Sittingbourne & Sheppey	South East	Labour	0.68%	Reform UK	Reform UK — GAIN	410
45	Thurrock	Eastern	Labour	0.69%	Reform UK	Reform UK — GAIN	390
46	Hartlepool	North East	Labour	0.70%	Reform UK	Reform UK — GAIN	500
47	Blyth & Ashington	North East	Labour	0.71%	Reform UK	Labour — Hold	420
48	Stafford	West Midlands	Labour	0.72%	Conservative	Conservative — GAIN	180
49	Warwick & Leamington	West Midlands	Labour	0.73%	Conservative	Labour — Hold	290
50	Southampton Test	South East	Labour	0.74%	Conservative	Labour — Hold	310

Key Battleground Analysis

Reform’s Key Targets

Reform UK’s most realistic gains are Labour-held Leave-voting English seats with Reform vote shares already above 30% in 2024. Seats like Leigh & Atherton, Wellingborough and Grimsby are all within reach on a further 5-point swing. Reform’s challenge is converting council and by-election wins into a concentrated MRP profile.

Lib Dem Holds vs. Con Recovery

The Lib Dems won 47 seats from the Conservatives in 2024 on tactical voting. In the South West and South East, a Conservative recovery of even 5 points would put seats like St Austell, Truro, North Devon and Chichester at risk. The Lib Dems need Labour to stay weak in these areas to hold their gains.

Conservative Rebuild Seats

The Conservatives need to retake Labour seats in the Midlands (Worcester, Swindon, Burton) to rebuild. These seats have Con–Lab margins of 2–5%, meaning a 3-point national Con swing without Reform eating further into their vote would flip them. Badenoch’s core pitch is to the same voters as Reform.

Labour’s Red Wall Under Siege

Labour won back many Red Wall seats in 2024, but on thin majorities of under 1%. These seats — Leigh, Don Valley, Barrow, Mansfield — are all credible Reform targets. Labour needs to defend 18 seats simultaneously while governing an unpopular government. Their main asset is the lack of a credible Con alternative in these areas.

More 2029 Analysis

How Much Swing Is Needed?

The table below shows how many percentage points of additional uniform swing (on top of current polling) each party needs to win their top target seats. Reform and Lib Dems have the most achievable pathways to new gains at current poll levels.

Party	Current polling	Top target seat	Swing needed	Within reach?
Reform UK	28%	Runcorn & Helsby	0.02%	Yes — already within margin
Conservatives	19%	Didcot & Wantage	0.22%	Yes — small swing needed
Lib Dems	13%	Hereford & S. Herefs	0.24%	Yes — realistic on current VI
Labour	18%	Defending top 10 seats	N/A	Holding, not gaining in this cycle
Greens	15%	Bristol area seats	5%+	Challenging without split vote
SNP	3%	Moray West	0.61%	Defending current hold

Regional Battleground Breakdown

North of England

Reform UK’s prime territory. Labour won seats like Leigh, Hartlepool and Blyth on thin majorities in 2024. If Reform’s by-election momentum holds in general election conditions, 8–12 northern seats could change hands. Labour’s incumbency advantage is their main shield.

Midlands

Split between Con vs. Lab fights (Worcester, Burton) and Reform incursions (Wellingborough, North West Leics). The East Midlands is the most volatile region in England. Three-way Con–Lab–Reform contests in the same seat are plausible here, making projections particularly uncertain.

South West & South East

The Lib Dem battleground. Glastonbury, Taunton, Chichester and Mid Sussex are classical LD–Con fights. A Conservative recovery of 3–5 points would threaten 10+ LD seats. Reform barely registers in these seats — the contest is binary LD vs. Con.

Wales

Labour holds Wales solidly but Reform is making inroads in post-industrial South Wales seats. Bridgend, Vale of Glamorgan and Aberafan Maesteg all have thin Labour majorities. Welsh devolution insulates some seats from English trends, but economic discontent is driving Reform polling above 20% in Wales.

Scotland

SNP holds on current polling despite 2024 losses. Moray West and Inverness are SNP–Con or SNP–Lab marginals. Scotland is largely unaffected by the Reform surge — Reform barely registers in most Scottish seats. The main story is whether a consolidated unionist vote can unseat SNP incumbents.

London & East

Labour holds London comfortably. Reform’s Essex seats (Clacton, Sittingbourne, South Basildon, Thurrock) are their most realistic gains in the South East — all four have Reform as a credible challenger on current polling averages, built on 2024 by-election and local election performance.