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Shift analysis

The Burnham Effect

By Grace Wilson | 7th July  2026

Based on shifts in our poll analysis from 29/06/26 - 05/07/26. 

Labour has gained 11 prospective seats this week, with gains stretching from Altrincham and Sale West in Greater Manchester to Penrith and Solway on the Scottish border, alongside marginal constituencies such as Colne Valley and Wycombe. This could signal that Labour’s improving national position under Burnham is beginning to feed through into constituency-level gains. Seats are returning across the North, the Midlands and Southern England, suggesting that Burnham’s lead up to Prime Minister has given Labour renewed momentum. 

With Reform losing 11 seats to Labour and 10 to the Conservatives, there are growing signs that Britain’s political scene is becoming more competitive once again. Reform would still emerge as the largest parliamentary party if an election were held tomorrow, securing a projected 212 seats, yet this week’s changes suggest its support is proving less immovable than it appeared only a week ago. Labour has regained ground in constituencies where centre-left voters had turned towards Reform, while the Conservatives have recovered several seats that had previously formed part of their electoral heartlands, including Beverly and Holderness and Mid Norfolk.

This remains a relatively modest shift, and it would be premature to assume Reform’s electoral advantage has disappeared. The party still holds a commanding lead. Yet this week’s update suggests the contest is becoming more fluid. After several weeks in which Reform appeared to dominate almost every part of the electoral map, both Labour and the Conservatives are now beginning to win constituencies back. Attention will now turn to Nigel Farage’s speech later today. Coming at a time when Reform has faced growing political and media scrutiny from Farage’s financial blunders, the speech means that Reform’s difficult week could further extend into the next forecast. 

Constituency Shifts

Altrincham and Sale West: Conservative -> Labour

Beverley and Holderness: Reform -> Conservative

Birmingham Hall Green and Moseley: Reform -> Labour

Broxbourne: Reform -> Conservative

Colne Valley: Reform -> Labour

Corby and East Northamptonshire: Reform -> Labour

Doncaster Central: Reform -> Labour

Fylde: Reform -> Conservative

Grantham and Bourne: Reform -> Conservative

Hastings and Rye: Reform -> Labour

Illford North: Reform -> Labour 

Mid Cheshire: Reform -> Labour

Mid Norfolk: Reform -> Conservative

North East Derbyshire: Reform -> Conservative

North East Somerset and Hanham: Reform -> Labour

Old Bexley and Sidcup: Reform -> Conservative

Pernith and Solway: Reform -> Labour 

Ribble Valley: Reform -> Conservative

South Leicestershire: Reform -> Conservative

South West Devon: Reform -> Conservative

Sussex Weald: Reform -> Conservative

Wycombe: Reform -> Labour

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