Even Ken Livingstone admits to being fascinated by the race and has offered to debate with all four candidates. Here, the Standard unmasks the outsiders. We reveal Mr Boff tried cannabis as a student, Mrs Borwick is a Harry Potter fan and Mr Lightfoot likes Billy Ocean. About 60,000 Londoners are expected to participate in the X-Factor-style vote to choose the candidate, with the winner being announced on 27 September, a day after the postal vote closes.