Metropolitan Police Service
Those who take part are often seen driving recklessly, on the wrong side of the road and on pavements.
She went missing in 1986 en route to meet a mystery client known only as 'Mr Kipper'.
Police were called to a block of flats on Wednesday.
Another man was injured in a separate shooting.
Sir Craig Mackey defended his decision, telling an inquest he had no protective equipment.
The officers were responding to reports of a fight.
Police are appealing for information on Peter Morley, 35.
Four civilians and a policeman were killed by Khalid Masood in March last year.
'No way' police can withstand the 'consequences of a no-deal'.