A record number of Londoners have come out to vote in the capital's mayoral elections where Ken Livingstone is hoping he can buck the national trend in the polls.

This year's mayoral elections have seen an estimated 2.4 million voters head to the polls - an estimated turnout of 45 per cent.

"We will only know the definite turnout at the end of the count. But this figure should be correct within two per cent either way," a London Elects spokesperson said.

It is the first time more than two million people have voted in this election. Almost 5.5 million people were registered to vote.

The turnout in 2004 was 37 per cent (1.9 million voters) while 2000 saw around 35 per cent of voters going to the polls.