You do not need to be a member of the Labour Party to vote.

Even if you are not a member of the Labour Party or an affiliated organisation, you can still sign up as a ‘supporter’ and vote to choose Labour’s next Mayoral candidate. It costs just £3, and a vote for Christian Wolmar will bring us a little closer to a affordable, liveable and sustainable London. You will need to sign-up by August 12th.

If you are a member of an affiliated organisation or Trade Union, then you are already entitled to vote in Labour's forthcoming selections for Mayor of London, Leader and Deputy leader.