Labour leader Ed Miliband announced he has appointed former Labour general secretary and union official Lord (Ray) Collins of Highbury to lead work on the introduction of a new system, which will consider an open primary process for the London mayoral candidate selection.
Lord Collins will also consider how the proposals could be spread to other parts of the country.
- Under Mr Miliband's proposals, any Londoner registering as a Labour supporter will be eligible to vote in the ballot to choose a candidate to replace Boris Johnson in 2016.
- A new code of conduct will be drawn up to cover all applicants to be Labour parliamentary candidates.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.