The number of voters who think Labour will win the next election has almost doubled in a year, according to a new poll that will come as a welcome boost to Andy Burnham after his first 100 days in office.

The More in Common survey found 42 per cent of the public think Mr Burnham’s party will be victorious, up from just 23 per cent last summer.

At that stage 58 per cent thought Labour was on course to lose the next election, a figure that has now fallen to 33 per cent.

Even among Reform voters 26 per cent now believe Labour will be triumphant, up from 11 per cent.

Louis O'Geran, external affairs manager at More in Common, said: “Just over a year ago, the idea of Labour winning the next election looked far-fetched to most Britons. Fewer than one in four thought it likely - remarkably low given Keir Starmer had won a historic majority just a year earlier.

“But in a sign of how much Burnham has shifted perceptions of the Labour government, that has now turned around.”

Polling expert, Tory peer Robert Hayward, told : “The shift between last year and this year is a combination of two factors. One is the demise of Keir Starmer as prime minister and the other one is a positive view amongst Labour voters towards Andy Burnham.

“The question is whether that positive view lasts through the Budget. How does it rest in five to seven days' time?”

The poll also found that 72 per cent of Labour’s 2024 voters think the party will win the next election, which has to be held by 2029, as well as 54 per cent of Liberal Democratic voters and 39 per cent of Conservative voters.

The Labour leader secured a ‘Burnham bounce’ in the polls when he succeeded Sir Keir Starmer this summer.

Labour has now overtaken Reform, who are even third in some surveys, behind the Tories.

The poll also found that the PM’s decision to float rejoining the EU could help him win over the coalition that gave Labour a landslide 167-seat majority in Parliament in 2024.

Overall, Britons think the move reflects well on Mr Burnham, by 45 to 27 per cent. That figure rose to 71 per cent of Labour voters in 2024.

On Tuesday, longtime Labour MP Diane Abbott called on the PM to consider an early election if the Budget goes well “because it's not going to get any better than this”.

But Mr Burnham ruled out calling a general election in the next 12 months, amid ongoing speculation that he could seek to consolidate his position, saying he was thinking “about people” and not “my own party and its prospects”.

More in Common asked 3,286 adults between 23 and 26 October.