Labour's backing in London may be on the rise to give them a lead over the Conservatives, according to an exclusive nationwide survey of voting intentions.

Across the region, 37 per cent of people said they are planning to vote Labour on Thursday, compared to 28 per cent who said that was their planned vote at the start of the election campaign.

The proportion of respondents backing the Tories is at 24 per cent, compared to 26 per cent backing the party at the start of the campaign.

A similar survey at the start of May found 35 per cent of respondents in the region said they were planning to vote Tory on June 8 compared to the 32 per cent who said they voted for the party in 2015, while the Labour vote was at 34 per cent, down from the 35 per cent who said they had voted for the party in 2015.

Other parties have seen their vote share squeezed by the contest between Labour and Conservatives - the Lib Dem vote was 6.6 per cent, compared to 7.2 per cent saying they supported the party at the start of the campaign, Ukip was 2.9 per cent, down from 3.7 per cent, and the Greens were on 1.6 per cent, down from 2.1 per cent.

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Seven in 10 of people who planned to vote Conservative at the start of the campaign are still backing the party (68 per cent), but 14 per cent have switched to Labour, and nine per cent say they are no longer sure who they will vote for.

Labour on the other hand seem to be picking up support from all sides, while 90 per cent of those who planned to vote Labour at the start of the campaign are sticking with their party, 21 per cent of people who previously planned to vote Lib Dem said they have switched to Labour, as have 21 per cent of those who had been planning to vote Green, and eight per cent of those previously backing Ukip

Three in 10 of respondents who said they were not sure what their vote would be at the start of the campaign are now behind Labour, compared to three per cent who have decided to vote Conservative, although 57 per cent still have not made up their minds.

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Labour's potentially improving prospects may be down in part to Jeremy Corbyn's performance, 62 per cent of respondents in the region think he's had the best general election campaign.

While 87 per cent of those planning to vote Labour think Corbyn has been having the best campaign, so do 61 per cent of Lib Dem voters, a bigger proportion than think Tim Farron is doing best.

Of those planning to vote Conservative, 63 per cent think Theresa May has had the best campaign, while three in 10, 30 per cent, think Jeremy Corbyn's has been better.

Missing the leaders' debate on BBC1 last week may not have helped the perception of May's performance, as 63 per cent of respondents said it was the wrong decision, including 87 per cent of those planning to vote Labour, 85 per cent of those backing the Lib Dems and even a fifth of Tory voters, 20 per cent, although 63 per cent of this group think she was right to skip the debate.

However, the survey suggests the debates had only a limited impact on how people are planning to vote, with 10 per cent of respondents saying it had caused them to change their vote. People now planning to vote Labour were the most likely to say they had changed their vote as a result of the debates, 15 per cent.

Labour voters were also the most likely to feel more fired up as a result of the debates, with 44 per cent saying they had made them even more determined to vote for their party, compared to 13 per cent of Conservative voters saying the same.

Most respondents said the party they were voting for (62 per cent) was most important, rather than the party leader, 22 per cent, or the local candidate, 18 per cent.

Social care and the NHS are the issues most likely to determine how a third of respondents are planning to vote, 31 per cent, including 48 per cent of those planning to vote Labour, followed by Brexit, the key issue for 20 per cent of respondents, including 39 per cent of Conservative voters, 37 per cent of Lib Dem voters and 35 per cent of Ukip voters.