London withdrew its bid to host the 2015 world athletics championships on Wednesday because of fears over a potential legal wrangle surrounding the future of the 2012 Olympic main stadium.

The decision leaves Beijing as the sole bidder and it is expected the International Association of Athletics Federations will confirm the Chinese capital as host city on November 20.

Britain's governing body for athletics, UK Athletics, said it planned to bid for the next championships in 2017.

UKA Chairman Ed Warner said he was disappointed not to be pursuing the 2015 bid but said "we need to present the IAAF with a bid that is free of any uncertainties."

The 2015 bid was ditched after it emerged the Olympic Park Legacy Company (OPLC), responsible for finding an anchor tenant for the 516 million pound (US$828 million) main stadium after the Olympics, could find itself open to a legal challenge over its bidding process.

Olympic minister Hugh Robertson said he became aware of a possible legal problem two weeks ago.

The OPLC's criteria only commits the winning bidder to provide an athletics legacy, not necessarily a track inside the main stadium.

The OPLC, a public sector not-for-profit company, will not make a decision on its preferred bidder until the turn of the year, with a lease agreement signed by the end of March, after the deadline for 2015 bids.

If a bidder wanted to move the track elsewhere they could argue the 2015 decision might disadvantage them by committing them to keeping the track where it was, leading to a claim for damages.

Premier League soccer club West Ham United has formally submitted a bid to take over the stadium, while rivals Tottenham Hotspur has teamed up with AEG, the US operator of London's O2 Arena, to mount a joint bid to lease it.

West Ham has agreed to keep the track while Tottenham has been reported as saying they would not.

Robertson said shortly before the UKA announcement: "I think it is much better if you think there might be a problem, which is really the issue here, to address it early. The real damage to our reputation would be if we messed this up and got hauled through the High Court by one of the stadium bidders."

IAAF President Lamine Diack said in a statement: "We fully understand and respect the reasons for UKA moving their bid from 2015 to 2017. We are delighted that London are still in the race."