Even the harshest critics of the Metropolitan Police admit the force has its work cut out with the Notting Hill Carnival.

Met commanders warn ‘not all risks will have been mitigated’ despite organisers’ insistence that new safety measures are in place

The Met said 21 people were recalled to prison, and 11 firearms and more than 40 knives seized in a bid to target those who 'pose the greatest risk' of causing trouble.