Moped crime is “out of control” and police are not doing enough to tackle it, senior Conservatives have warned, as footage emerged showing armed gangs targeting drivers stationary in traffic.

Stephen Greenhalgh, the former deputy mayor for crime in London, said criminals were targeting parents picking up their children from private schools and officers were failing to stop them.

It comes days after Michael McIntyre, the comedian, had his watch stolen while in his Range Rover with his son.

Sadiq Khan, the Mayor of London, told the Home Secretary to “walk the walk” and hand over extra cash as a police video showed men being robbed of their watches while waiting at a junction in London.

The footage, filmed on a dash-cam, shows four men pull up alongside the car on two scooters before threatening the occupants with a hammer and a knife, stealing their watches and stamping on their windscreen.​