A man has suffered life threatening injuries after a crash involving a Mercedes and a Yamaha motorcycle on the M25 near a slip-road for the M4. 

Thames Valley Police is appealing for witnesses following the collision on the M25 clockwise at Junction 15, at the entry slip road from the M4.

The crash took place at at 10.45am on Sunday. 

The incident involved a blue Mercedes S350 AMG and a red Yamaha motorcycle.

The rider of the motorcycle, a man in his forties, suffered life threatening injuries and remains in hospital in a serious condition.

Investigating officer PC Alistair Bennett of the Joint Operations Roads Policing Unit, said: “We are appealing for witnesses to come forward following this serious injury collision.

“We are conducting enquiries however we are appealing for the public’s assistance.

“If anyone has witness information or dash-cam footage of this incident we would ask them to please get in touch via our online webform or by calling 101 quoting reference 43240556436.”