A man has suffered 'serious and life changing' injuries in a crash on the M25 on Sunday morning. 

Just after 5.30am on Sunday (July 17) a black Mercedes C Class saloon crashed with the back of a grey Mazda.

The 44-year-old driver of the Mazda was seriously injured and is currently being treated at St Mary's Hospital, Paddington.

Investigating officer PC Antony Cope, from the Joint Operations Unit for Roads Policing based at Amersham, said: "I would like to speak to anyone who witnessed the collision or anyone who saw the Mercedes travelling prior to the collision.

"If you have any information which could assist the investigation please call our 24-hour non-emergency number on 101."

To give information anonymously, call Crimestoppers on 0800 555 111. 

No personal details are taken, information is not traced or recorded and you will not go to court.