The passenger of a car involved in a collision last month threatened the other driver and produced a knife, police have revealed.

The incident happened between 11.20am and 11.30am in Oak Avenue, Bricket Wood, following a collision between a black Fiat 500 and a silver VW Passat.

The passenger in the Fiat threatened the driver and revealed he had a knife on him before getting back in the car which was driven off towards the M1.

An image of the passenger has been released and police are keen to speak with him or anyone who can identify him on the non-emergency number 101.

Alternatively, you can contact the independent crime-fighting charity Crimestoppers anonymously on 0800 555 111 or through their anonymous online form.