Keir Starmer has seen a bounce in his poll ratings after praise for his response to the Ukraine crisis.
The PM has seen his net approval score rise by 11 points over the past week, although it still remains deep in negative territory at minus 28.
The Labour leader has also overtaken Nigel Farage to be the most popular choice as premier, with 28 per cent saying he was the best option in the latest research by More in Common.
The boost comes after a dramatic week that saw Sir Keir make a successful trip to the White House – and then engage in frantic diplomacy after Volodymyr Zelensky’s visit descended into a public slanging match with Donald Trump.
Tories have spoken out to welcome his move to offer international leadership, convening a high-level summit involving Europe and Canada to thrash out a strategy on Ukraine.
Labour MPs believe it was the PM’s best week yet, after a difficult and error-strewn opening to his time in Downing Street.
The More in Common polling started being conducted on Friday night after the Oval Office meltdown, and was completed yesterday.
It found a five point rise in people approving of Sir Keir’s performance, while disapproval was down six points.
Some 28 per cent thought he was the best candidate for PM, up from 22 per cent last week.
That meant he leapfrogged Reform leader Mr Farage, who has been wriggling over his close alliance with Mr Trump and had 22 per cent support.
Tory leader Kemi Badenoch remains further behind on just 12 per cent.
More in Common detected 56 per cent thinking the handling of Ukraine negotiations reflected well on the Government, with just 9 per cent saying it was a negative.