When is the next London mayor election and how are they elected?

The mayoral debates are on TV tonight (Picture: Getty/Shutterstock)Sadiq Khan is fighting to be re-elected as Mayor of London.
In the City Hall elections due to take place on Thursday May 2, the Labour politician is battling with 12 other candidates.Khan, as well as Conservative Susan Hall, the Greens’ Zoe Garbett and Lib Dem Rob Blackie, took part in a debate that will be broadcast on Thursday April 25 at 8pm, on BBC One.The mayoral candidates clashed on the Met Police, violent crime, aff