Meanwhile the final public meetings in the consultation process for the Mayor's policing plan take place tonight in Barking and Havering.
Have your say on London's Police and Crime Plan:
Boris wants to gather the views of people who live, travel and work in London, particularly those who have been affected by crime.
Your views will inform the final version and future revisions of the Police and Crime Plan.
Have your say by filling in the online form before 6 March.
More top news
Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.