Witnesses to a serious crash which left a motorcyclist with “life-threatening” injuries are being asked to come forward by police.

Officers were called to reports of a collision between a car and a motorcycle on Lime Grove, Ruislip, at around 4pm on Wednesday.

Ambulances and an air ambulance attended the scene, taking the 47-year-old rider of the motorcycle to hospital for treatment to his serious injuries.

The car involved – a white Lexus – stopped at the scene.

No arrests have been made and next of kin have been informed.

Anyone who was in the area and witnessed the collision is asked to contact the Serious Collision Investigation Unit based on 020 8991 9555.