Meanwhile, prominent Tories who could be ousted include former home secretary Suella Braverman and Shadow Housing Secretary Sir James Cleverly.

The SNP would take 40, the Lib Dems 35, the Greens nine, while six would go to other parties and five to Plaid Cymru, according to the MRP poll.

More in Common UK director Luke Tryl said: “Reform continues to hold poll position in our MRP.

“Based on polling since the budget, it suggests that in an election tomorrow Reform could hope to secure a substantial three-figure majority.

“Meanwhile the Polanski surge sees the Greens continue to make gains, with disillusioned progressives putting them within shouting distance of many more gains from Labour.

“On the other hand, Labour would slump to a modern low, losing over half of the total number of seats in parliament and being reduced to just 85 MPs.

“While the Tories would lose a further 50 from their 2024 nadir, this projection actually represents an uptick in the Tories’ fortunes and signs that the Badenoch bounce may at least be stabilising their position in places like the ‘Blue Wall’ – even as they lose seats to Reform in their Brexit-voting former heartlands.”

However Mr Tryl said that tactical voting could see Reform deprived of a majority.

He said: “For the first time we have explored how tactical voting could reshape the model projections.

“It suggests the Liberal Democrats could be big winners here – and if that if tactical voting is anywhere close to the scale we saw in Caerphilly, that parties of the left could deny Reform a majority and form a rainbow coalition of their own.

“The threat of tactical voting, combined with the narrow margin of many of Reform’s projected victories, suggests their momentum may have at least temporarily stalled.

“That, combined with the fact we are still years from an election, means that despite their success in 2025, the path to the next general election is still far from known.”