These are the Lib Dems' most marginal seats, based on the lowest percentage swing required for the result to differ from VoteClimate's Forecast For The Next General Election.

First we list the seats where, based on current opinion polls, the Lib Dems should expect to win by up to 10%. Then we list the seats where the Lib Dems are predicted to be within 5% of winning the seat.

These are seats where Registering with VoteClimate will have the maximum influence on party policies. So if you have climate-concerned friends and family in these areas, please invite them to join us!

Forecast vote shares (GB): Reform: 27% | Labour: 18.8% | Conservative: 18.3% | Green: 14.5% | Liberal Democrat: 12.2%

[Last updated: June 2026]

Constituency	Lib Dems Forecast		Expected Competitor		Predicted Majority / Votes Required
Carshalton and Wallington	1st	18,365	Reform	11,009	7,356	9.9%
Witney	1st	18,994	Reform	11,798	7,196	9.5%
Didcot and Wantage	1st	20,127	Reform	12,526	7,601	9.4%
Dorking and Horley	1st	18,915	Reform	12,180	6,735	9.4%
Bicester and Woodstock	1st	18,078	Reform	11,138	6,940	9.3%
Epsom and Ewell	1st	19,246	Conservative	12,250	6,996	9.1%
Caithness, Sutherland and Easter Ross	1st	18,640	SNP	12,343	6,297	8.4%
Mid Dorset and North Poole	1st	22,642	Conservative	16,433	6,209	8.2%
North Norfolk	1st	17,667	Conservative	11,869	5,798	8.1%
St Neots and Mid Cambridgeshire	1st	17,814	Reform	11,479	6,335	8.1%
Chelmsford	1st	18,538	Reform	12,306	6,232	8.1%
Horsham	1st	19,913	Conservative	13,630	6,283	7.9%
Melksham and Devizes	1st	18,304	Conservative	12,479	5,825	7.9%
Newbury	1st	17,873	Conservative	12,169	5,704	7.9%
Glastonbury and Somerton	1st	18,199	Reform	12,495	5,704	7.8%
Mid Dunbartonshire	1st	19,530	SNP	13,780	5,750	7.8%
North Devon	1st	19,472	Reform	13,328	6,144	7.8%
Thornbury and Yate	1st	19,014	Reform	13,296	5,718	7.3%
Sutton and Cheam	1st	16,454	Reform	11,257	5,197	7.2%
North East Hampshire	1st	19,463	Conservative	14,625	4,838	6.3%
Hazel Grove	1st	16,279	Reform	12,238	4,041	5.5%
Tiverton and Minehead	1st	16,628	Reform	12,771	3,857	5.4%
Godalming and Ash	1st	20,525	Conservative	16,531	3,994	5.3%
Frome and East Somerset	1st	15,050	Reform	11,425	3,625	5.2%
Eastleigh	1st	14,841	Reform	11,384	3,457	4.9%
Torbay	1st	16,973	Reform	13,267	3,706	4.9%
Ely and East Cambridgeshire	1st	16,105	Reform	12,512	3,593	4.5%
East Hampshire	1st	15,868	Conservative	13,201	2,667	3.8%
Sheffield Hallam	1st	18,514	Labour	15,814	2,700	3.7%
Farnham and Bordon	1st	16,447	Conservative	13,716	2,731	3.6%
Romsey and Southampton North	1st	16,384	Conservative	14,262	2,122	3.0%
North Dorset	1st	15,221	Reform	13,248	1,973	2.7%
North Cotswolds	1st	13,284	Conservative	12,745	539	0.7%
Newton Abbot	1st	13,934	Reform	13,630	304	0.4%
South Shropshire	2nd	14,864	Reform	14,891	27	0.0%
Bermondsey and Old Southwark	2nd	9,085	Labour	9,475	390	0.6%
Hamble Valley	3rd	14,042	Reform	14,492	450	0.6%
Inverness, Skye and West Ross-shire	2nd	15,222	SNP	16,110	888	1.1%
South West Hertfordshire	3rd	11,451	Reform	12,538	1,087	1.5%
Mid Buckinghamshire	2nd	13,557	Conservative	14,820	1,263	1.7%
Beaconsfield	2nd	12,318	Conservative	13,534	1,216	1.7%
Salisbury	2nd	11,624	Conservative	13,028	1,404	2.0%
West Worcestershire	3rd	12,425	Conservative	14,384	1,959	2.5%
Exmouth and Exeter East	3rd	11,137	Reform	13,543	2,406	3.0%
Birmingham Hall Green and Moseley	5th	4,352	Reform	7,083	2,731	3.5%
Aylesbury	3rd	10,295	Reform	13,127	2,832	3.6%
Brecon, Radnor and Cwm Tawe	3rd	9,494	Reform	12,318	2,824	3.9%
Sevenoaks	3rd	12,032	Reform	14,925	2,893	3.9%
Cambridge	3rd	10,105	Labour	13,030	2,925	4.2%
Windsor	3rd	9,236	Conservative	12,361	3,125	4.3%
Watford	4th	7,575	Reform	10,737	3,162	4.3%
Hinckley and Bosworth	3rd	11,033	Reform	14,406	3,373	4.4%
Runnymede and Weybridge	3rd	10,450	Conservative	13,803	3,353	4.6%
Torridge and Tavistock	3rd	11,532	Reform	15,162	3,630	4.9%

Liberal Democrats Key Battleground Seats