Who would make best PM?: May 44 (-6) / Corbyn 38 (+2) — Survation.

This is Corbyn's best ever score in a Survation poll.

May's ratings continue to drop nearly a month since the general election.

ICM: Labour 43% (+7) / Conservatives 41% (-2)

LONDON — Labour leader Jeremy Corbyn's popularity continues to surge since the shock general election result of last month, according to new opinion polls.

Polling company Survation published new data on Tuesday suggesting that 38% of Brits would prefer Corbyn to be prime minister over Theresa May. This is Corbyn's highest ever rating for 'Best Prime Minister' in a Survation poll.

May still has a lead over Corbyn according to Survation's findings, with 44% of respondents saying she'd make the best prime minister. However, this is a six percent decrease compared to her rating in Survation's last opinion poll.

Also in an ICM/Guardian poll published today, Corbyn has a huge lead over Prime Minister May in approval ratings, with 44% of those surveyed thinking the Labour leader is doing a good job, compared with 35% who think he is doing a bad job, giving him a net score of +9.

May only scores 28% for good job, contrasting with 54% for bad job, giving her a net score of -24. The two party leaders have effectively swapped places since May called a snap election at the end of April.

Corbyn has almost doubled his rating since Survation began asking the question two months ago, while May's ratings have continually moved in the opposite direction.

The chart below illustrates how public opinion on May and Corbyn has shifted dramatically over the last few weeks.

The ICM/Guardian poll also shows Labour gaining 9% since the election, as they are on 43% compared with the Conservative's 41%. That means the Tories have dropped five points since the vote.

A YouGov survey published at the end of last month said that Corbyn was the preferred choice of the British public to be prime minister for the first time ever. 35% said he would make the best PM, while 34% said May.

May's leadership has come under severe pressure since the Tories lost their parliamentary majority on June 8, particularly over her response to the Grenfell Tower fire, the Conservative party's "confidence and supply" deal with the DUP and the government's reluctance to change its position on public sector pay.

The PM has also increasingly become an isolated figure within Downing Street as many of her top aides have left.

Over half of Conservative Party members believe May should resign before the next general election, which is scheduled to take place in 2020. 15.7% want her to step down immediately, according to a ConservativeHome poll.

Meanwhile, Corbyn continues to tout Labour as the government in waiting, telling supporters that he will be prime minister in six months. Labour MPs spent Saturday campaigning in Tory marginals which they see are up for grabs at the next election. Corbyn visited Hastings where Home Secretary Amber Rudd has a wafer-thin majority of 346.

On Monday the Labour leader appointed twenty new junior shadow ministers, including Chris Williamson as shadow fire minister. Williamson has been one of Corbyn's most vocal supporters.

Conservative MPs are now largely backing May to continue as prime minister to ensure that another election is not called, as they fear Labour could win.

The Tories have a working majority of 13 over the opposition, but with resignations, defections and by-elections, the balance of power in the House of Commons could easily change.

A majority of those polled also oppose the Tory-DUP deal, which was secured with a £1.5 billion agreement. 57% of respondents disagree with the 'confidence and supply' arrangement between the two parties, while 32% agree.

Survation was one of the polling companies that most accurately predicted the general election. The polling group suggested that there would be a hung parliament.