The Ipsos-MORI survey for the Evening Standard shows a leap in support for the Tories if London's mayor replaced David Cameron as leader.
Boris Johnson has put an end to years of speculation by confirming he will try to run as an MP in 2015, meaning he could be PM by 2020.
David Cameron and Boris Johnson pulled over their car this morning after noticing a woman who had collapsed on the street in Harrow.
There has been both praise and criticism over news London Mayor Boris Johnson will "probably" run to be an MP in the 2015 General Election.
Interesting and excellent news that @mayoroflondon wants to rejoin the Commons and stand as an MP next year!
Boris Johnson is already a part-time mayor, now will be even more of one. Always cared more about his ambitions than #London's problems.
Boris Johnson says that although he is likely to run for Parliament in next year's general election, he still intends to serve out his term as Mayor of London until its end in 2016.
Mr Johnson made the remarks at a speech in London this morning where he said he would "in all probability" try to run for Parliament next year.
London mayor Boris Johnson has said he will look for a seat to run for Parliament in 2015 "in all probability".
ITV News Deputy Political Editor Chris Ship is following developments.
NEW: Boris says "in all probability I will try to find somewhere to stand in 2015"
Boris Johnson has said he will try to run for Parliament in next year's general election.
London mayor Boris Johnson will say that life outside the "sclerotic" European Union is an "attractive" option for Britain.
Mr Johnson will stress that remaining in a streamlined EU remains the best option however he will also say the UK should not fear leaving the group if it cannot secure necessary reforms.
A looser association with the EU could boost trade with the rest of the world and add 1.1% to GDP, he will say.
Mr Johnson will also endorse an eight-point plan for reforming the group, going beyond the goals set out by David Cameron ahead of a possible in-out referendum in 2017.
The move has reignited speculation the London mayor is wooing Eurosceptics with a view to a future Tory leadership bid.
A Formula One Grand Prix on the streets of London may have moved a step closer after the Government announced new powers for local authorities to stage motor races on public roads.
David Cameron unveiled the move as he opened Williams' new F1 engineering facility in Oxfordshire, saying it would mean "more races, more events, more money coming into our country".
He said: "We're going to change the rules so that local councils are able to make the decision so you don't have to have a private member's Bill through Parliament, which we think will be great news for British motor sport."
The Prime Minister also hailed the F1 industry, saying it was "an amazing success story, eight of the 11 teams based here in the United Kingdom, 41,000 people working in the industry in the Oxford area alone, working for about 4,300 companies".
London Mayor Boris Johnson has signalled he is ready to support the idea of a Monaco-style Grand Prix on the streets of the capital.
The former headmaster of a prep school London mayor Boris Johnson attended has been arrested on suspicion of historic sex assaults.
Clive Williams, 69, was also questioned by officers on Wednesday over allegations of child neglect, Press Association sources said. He was the headmaster at Ashdown House Preparatory School in Forest Row, East Sussex, for more than 25 years before leaving in 2003.
A computer and documents have been seized by police investigating the claims against Mr Williams, who was released on police bail and has not been charged.
A Sussex Police spokesman said: "Officers investigating allegations of historic sexual abuse at a school in East Sussex have arrested a local man. The 69-year old was arrested at an address in Barcombe on Wednesday July 9 on suspicion of sexual assaults and child neglect.
"A computer and documentation were seized for examination. After being interviewed, the man was released on police bail on the same day until November 11, while inquiries continue."
Labour leader Ed Miliband is the latest politician to be caught out on the cost of everyday items after he struggled to name the average cost of a weekly shop for a family, during an interview with Good Morning Britain.
David Cameron was tripped up last year when he claimed the price of budget supermarket bread was "well north of a pound", when at the time it was 47p.
He later claimed he did not know the price because he had a breadmaker at home.
London Mayor Boris Johnson told BBC presenter Jeremy Paxman that a pint of milk cost "about 80p or something like that".
Shortly after being elected Liberal Democrat leader, Nick Clegg was challenged by a caller on an ITV News local show about how much state pensioners received. The Deputy Prime Minister said "about 30 quid" when the figure at the time was £90.70 a week for a single person.
Boris Johnson and Nick Clegg have been recognised as unlikely radio stars at an industry awards ceremony.
The Mayor of London and the Deputy Prime Minister - together with presenter Nick Ferrari and the rest of their LBC production team - were given the title for the "innovative strand" of programmes for their phone-in shows featuring the pair.
Mr Johnson joked: "Well this is absolutely absurd. Of course I know I'm not really the recipient - I'm like an overweight Belgian tourist being propelled to the summit of this Everest by the skills of superior Alpinists, our LBC production team.
"I'd like to thank the efforts of the great Sherpa, Clegg, and the people of London who have listened in their dozens and called in, and to my fellow overweight Alpiniste, Nick Ferrari."
The Radio Academy judges praised the team behind the shows for placing politicians "front of mic, hosting their own show, on a regularly scheduled basis, something never before attempted on UK radio".