Reported crime at this year's Notting Hill Carnival is "significantly down" on last year's event, police have said.
There were a total of 301 arrests as part of the Met Police's Notting Hill Carnival operation.
They were broken down as:
18 for assault on police
6 for criminal damage
64 for public order offences
19 for possession of an offensive weapon
96 for drugs
16 for theft
3 for sexual assault
12 for robbery
10 for GBH
14 for common assault
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Mr Johnson vowed to lie down in front of the bulldozers when he was elected MP for the west London constituency of Uxbridge & South Ruislip
The course is designed to help spot the signs of suspicious behaviour.