A city worker has told of how he sprung into action to help a young motorcyclist who was seriously injured in a crash on the A2.

Phil Wright was on his way home when he saw traffic beginning to slow down on the coastbound carriageway at about 7.15pm on Thursday.

The father-of-five, who is trained in first aid and was also riding a motorbike, said he "didn’t think twice" about making his way to the front of the growing traffic to see if he could help.

Mr Wright found the 21-year-old, whose name is James, lying on his back screaming in pain.

His motorcycle lay in a mangled heap 50 yards in front of him.

He had suffered broken bones and a collapsed lung.

A lorry and a tractor with a trailer attached were involved in the incident, which happened between junction two for the M25 and the B255 junction for Bluewater.

A van that drove off after the crash is also believed to have been involved.

Grain resident Mr Wright said: "He was trying to get up and I had to hold him down. We were comforting him and talking to him until the emergency services arrived."

As others also rushed to help, Mr Wright made sure traffic was diverted away from the two inside lanes of the carriageway.

The part-time actor said James was "very lucky to be alive".

He praised the ambulance staff that treated him and fellow motorists who also went to James’ aid.

"They were fantastic, I don’t think he could have received better care," said Mr Wright, who plans to visit James at Kings College Hospital in London this week.

He has already had a phone call from James’ dad to thank him for his help.

The collision involved the bike rider, a lorry and a tractor with a trailer attached between J2 for the M25 and the B255 junction for Bluewater.

The coastbound carriageway of the A2 was closed from junction 2 of the M25 to the Bean interchange.

Police are asking for anyone with information to call the Serious Collision Investigation Unit on 01622 798538.