Labour MPs could trigger a Brexit nightmare for Sir Keir Starmer in 252 seats, new analysis conducted by GB News has revealed.
The People’s Channel found almost two-thirds of Labour-held seats voted for Brexit in 2016, with just 157 supporting continued membership of the European Union.
Dozens of Labour MPs who represent these seats are part of the Labour Movement for Europe, which is putting pressure on the Prime Minister to forge closer ties with the Brussels bloc.
Three Labour MPs from Brexit-backing seats have already voted for the UK to rejoin the customs union, with Richard Burgon, Imran Hussain and Peter Lamb voting for a Ten Minute Rule Bill proposed by the Liberal Democrats.
However, an even bigger parliamentary test looms for Sir Keir.
The Liberal Democrats have vowed to table an amendment to the Prime Minister’s EU reset legislation to force Labour to negotiate a customs union deal.
Graham Stringer, Labour’s lone Brexiteer in the House of Commons, warned: “We certainly risk losing seats [to Reform UK] if it passes, and I suspect it might.
“What I see in my mailbox, from people who voted to leave the EU in 2016, is that this is about trust.”
GB News’s number-crunchers dissected how many seats could be included in a Brexit revolt by mapping on Leave support with the constituencies now poised to vote for Reform UK or the Conservative Party.
The overall figure shows Labour would lose 232 of its 252 Brexit-backing seats to Reform UK, with four being won by the Tories and another being picked up by Plaid Cymru.
Meanwhile, Labour would cling onto just 15 seats vulnerable to a Brexit revolt.
Reform gains (232): Aberafan Maesteg, Aldershot, Amber Valley, Ashford, Ashton-under-Lyne, Aylesbury, Banbury, Barking, Barnsley North, Barnsley South, Barrow & Furness, Basingstoke, Bassetlaw, Bexleyheath & Crayford, Bishop Auckland, Blackley & Middleton South, Blackpool North & Fleetwood, Blackpool South, Blaenau Gwent & Rhymney, Blyth & Ashington, Bolton North East, Bolton South & Walkden, Bolton West, Bournemouth East, Bournemouth West, Bracknell, Bradford South, Bracknell, Bridgend, Broxtowe, Burnley, Burton & Uttoxeter, Bury North, Bury South, Bury St Edmunds & Stowmarket, Calder Valley, Camborne & Redruth, Cannock Chase, Carlisle, Castleford, Pontefract & Knottingley, Chatham & Aylesford, Chesterfield, Clwyd East, Clwyd North, Colchester, Colne Valley, Congleton, Corby & East Northamptonshire, Coventry East, Coventry North West, Crawley, Crewe & Nantwich, Darlington, Dartford, Dagenham & Rainham, Derby North, Derby South, Derbyshire Dales, Doncaster Central, Doncaster East & the Isle of Axholme, Doncaster North, Dover & Deal, Dudley, Dunstable & Leighton Buzzard, Easington, East Thanet, East Worthing & Shoreham, Ellesmere Port & Bromborough, Eltham & Chislehurst, Erewash, Forest of Dean, Folkestone & Hythe, Gateshead Central & Whickham, Gedling, Gillingham & Rainham, Gloucester, Gorton & Denton, Gravesham, Great Grimsby & Cleethorpes, Halifax, Halesowen, Harlow, Hartlepool, Hastings & Rye, Heywood & Middleton North, High Peak, Houghton & Sunderland South, Huddersfield, Hyndburn, Ipswich, Isle of Wight West, Jarrow & Gateshead East, Kettering, Kingston upon Hull East, Kingston upon Hull North & Cottingham, Kingston upon Hull West & Haltemprice, Lancaster & Wyre, Leeds East, Leeds South West & Morley, Leeds West & Pudsey, Leicester West, Leigh & Atherton, Lichfield, Lincoln, Lowestoft, Luton North, Luton South & South Bedfordshire, Makerfield, Mansfield, Merthyr Tydfil & Aberdare, Middlesbrough & Thornaby East, Milton Keynes Central, Mid & South Pembrokeshire, Mid Derbyshire, Montgomeryshire & Glyndŵr, Morecambe & Lunesdale, Neath & Swansea East, Newcastle-under-Lyme, Newton Aycliffe & Spennymoor, Normanton & Hemsworth, North Durham, North East Derbyshire, North East Hertfordshire, North Northumberland, North Warwickshire & Bedworth, North West Cambridgeshire, North West Leicestershire, Northampton North, Northampton South, Norwich North, Nottingham North & Kimberley, Ossett & Denby Dale, Penistone & Stocksbridge, Penrith & Solway, Peterborough, Plymouth Moor View, Plymouth Sutton & Devonport, Poole, Portsmouth North, Portsmouth South, Preston, Rawmarsh & Conisbrough, Redcar, Redditch, Ribble Valley, Rochdale, Rother Valley, Rotherham, Rossendale & Darwen, Rugby, Salford, Scarborough & Whitby, Scunthorpe, Selby, Sheffield Brightside & Hillsborough, Sheffield Heeley, Sheffield South East, Sherwood Forest, Shipley, Sittingbourne & Sheppey, Slough, Smethwick, South Derbyshire, South Dorset, South East Cornwall, South Ribble, South Shields, South West Norfolk, Southampton Itchen, Southend East & Rochford, Southend West & Leigh, Spen Valley, Stafford, St Austell & Newquay, St Helens North, St Helens South & Whiston, Stalybridge & Hyde, Stevenage, Stoke-on-Trent Central, Stoke-on-Trent North, Stoke-on-Trent South, Stourbridge, Sunderland Central, Swindon North, Swindon South, Tamworth, Telford, Thurrock, Tipton & Wednesbury, Torfaen, Vale of Glamorgan, Wakefield & Rothwell, Walsall & Bloxwich, Warrington North, Warrington South, Washington & Gateshead South, Watford, Welwyn Hatfield, West Bromwich, West Lancashire, Weston-super-Mare, Whitehaven & Workington, Widnes & Halewood, Wigan, Wolverhampton North East, Wolverhampton South East, Wolverhampton West, Wellingborough & Rushden, Worcester, Worthing West, Worsley & Eccles, Wrexham
Graham Stringer, a veteran Labour MP, warned Reform UK could benefit from backtracking on Brexit | GETTY