A Labour supporter campaigning for Sadiq Khan to become Mayor of London appeared to break strict Electoral Commission rules - after handing out leaflets outside a polling station. The activist was captured on film at Overland Children's Centre in Bow, London where members of the public were queuing to cast their votes. Leaflets clearly showing Mr Khan's face were given to people at the end of the long line as they waited to get their ballot papers. A spokeswoman for the Electoral Commission told MailOnline this afternoon: 'Parties and candidates are allowed to campaign on polling day, but not within the perimeters of a polling station.