A teenage racing driver who lost both his legs in a near-fatal crash has completed a charity walk to thank those who saved his life.

Billy Monger crashed on live television at 120mph during a Formula 4 race at Donnington Park in April.

The 18-year-old had to be cut free from the wreckage of his car and was airlifted to hospital by an air ambulance crew.

After being put into an induced coma, doctors were able to keep him alive, but they were unable to save his lower legs.

Since then a funding campaign to help his recovery has raised £850,000, with donations pouring in from celebrities such as Lewis Hamilton to support him.

Yesterday, Billy, who is known by fans as Billy Whizz for his speed on the track, took to the pit lane at Brands Hatch to complete a charity walk to raise money for the air ambulance.

Hundreds showed their support at the race track for the inspirational teen, and he only had two days to practise walking on his new legs and crutches.

He told Sky News: "The main reason behind me wanting to do it was to make sure we get the awareness out there and to raise some money for the air ambulance, especially with all it has done for me over the last few months.

"With the support I've had, it's really important for me to spread a good message to everyone and to try and show that even if something like this happens you can still stay positive and do something with your life."

Billy Whizz now hopes to get back into competitive racing, he has been driving in specially adapted cars.

He added: "My main aim is to get back to it and not only to compete but to be as competitive and drive to the same ability as before."