Police believe they have made a breakthrough in the shocking Cheam hit and run where CCTV video appeared to show a motorcyclist shouting at an unconscious man who had been knocked out in the crash.

Yesterday police in Sutton arrested a 16-year-old boy for three offences connected to the incident; theft of vehicle, dangerous driving and failing to stop after an accident.

Now they have now turned their attention to tracking down the driver of a stretch limo seen near the smash.

Officers from Sutton police released video footage that showed pedestrian Dr Tim Wilks, a 53-year-old father of three and programme director for Epsom & St Hospitals, knocked down as he was crossing Malden Road with Cheam Common Road on Saturday, February 28.

Following the arrest police continue to appeal for information.

A spokesman said: "As traffic began to move off from the junction, a motorcycle collided with the man, sending him careering down the road. The rider, who was knocked off his bike during the collision, is then seen to get up and angrily berate the stricken pedestrian before getting back on his motorcycle and driving off down Cheam Common Road.

"As he makes off, a car which was waiting at traffic lights at Malden Road pursues the motorcycle down Cheam Common Road.

"Officers are also appealing to the occupants of that car to get in contact with officers as they may be able to assist the investigation. They are also keen for the driver of a stretch limousine car seen at the junction at the time to come forward along with anyone who has information about the registration index of the motorcycle.

"The pedestrian was taken to a south London hospital for treatment to his injuries - his condition is not life threatening.

"The motorcycle suffered some damage during the collision, losing a top box and mudguard."

Anyone who witnessed this incident is asked to contact Sutton Police on 101 or contact Crimestoppers, anonymously, on 0800 555 111. Police have released CCTV of the collision.

The teenager was bailed to return in mid-May