Police investigating a road traffic collision in Watford have released CCTV images of a man they would like to speak to for help their enquiries.

Shortly after 6pm on Monday, August 28, a BMW and a motorcycle crashed in North Approach, Leavesden.

The rider of the motorcycle suffered serious injuries and was airlifted to hospital. He remains in hospital in a serious condition.

The BMW was not at the scene when police arrived and was later found unattended.

Police would like to speak to the person pictured as they may have been in the area at the time and could have information which will assist the investigation.

Anyone who recognises him is asked to contact Watford Local Crime Unit on the non-emergency number 101, quoting C4/17/2535, or use the online reporting form at www.contacthertspolice.uk/Report