London's colourful mayor Boris Johnson will wear an Australian cricket shirt for a day if the Aussies manage to win the coming Ashes series in England.
The great Australian legspinner Shane Warne forced Johnson into the wager during an appearance at The Oval to promote volunteering in the capital.
Warne took the challenge to the mayor who appeared reluctant to agree before accepting.
The five-test Ashes series starts in the second week of July.
