A jury has retired to consider its verdict in the case of a man accused of supplying a gun to Mark Duggan, shortly before Mr Duggan was shot dead by police, triggering last summer's riots.
Kevin Hutchinson-Foster, 30, has admitted to a jury at Snaresbrook Crown Court that he borrowed an illegal firearm. But he claims he gave it back a week before Mr Duggan was shot.
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The meeting was arranged in the wake of Wednesday's terrorist murder of four people in Westminster.
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.