Londoners will be able to vote in American presidential-style primaries to choose Labour's next candidate for mayor.
Party members and people who register as Labour supporters can have their say.
The change announced today by Ed Miliband reduces the impact of trade unions on the selection of candidates.
The details now from our Political Correspondent Simon Harris
More top news
Five teenagers have been arrested in London on the suspicion of preparation of acts of terrorism.
The RSPCA is investigating after an extremely underweight pedigree Victorian bulldog was discovered abandoned on an East London street.
Police are issuing a fresh appeal for witnesses after a severe attack left a 29-year old woman in a life-threatening condition.