When voting for Mayor Londoners are able to cast one vote for their first preference candidate and one vote for their second preference.
If no candidate secures more than 50% of the first preference votes the two highest scoring candidates go through to a second round and all second preference votes allocated to the candidate they were cast for.
The candidate with the highest number of first and second preference votes is then elected Mayor.
45% of respondents in today’s Comres poll say they will give their first preference vote to Johnson while 36% say they’ll vote for Livingstone.
The poll also suggests that Green candidate Jenny Jones is third placed with 6% of the vote, ahead of Liberal Democrat Brian Paddick who is on 5%.
Independent Candidate Siobhan Benita is the choice of 3%, ahead of UKIP’s Lawrence Webb and the BNP’s Carlos Cortiglia who tie on 2%.
After second preference votes are taken into account the poll suggests Johnson is the choice of 54% of voters while Livingstone has the support of 46%.
A previous Comres poll gave Mr Johnson a 6 point lead while a YouGov poll published on Monday suggested just 2% separates the two front runners.
Candidates for Mayor include Jenny Jones (Green party), Ken Livingstone (Labour), Lawrence Webb (UKIP) Boris Johnson (Conservative) and Brian Paddick (Liberal Democrat). A full list of candidates can be found here.
Candidates standing as London Assembly constituency members can be found here. Candidates for the 11 Assembly London-wide seats can be found here.
