A POPULAR mountain biking challenge in aid of the Great North Air Ambulance (GNAAS) is set to return to raise money for the charity.

The Hamsterley Beast, based at Hamsterley Forest, in County Durham, is set to see hundreds of mountain bikers take on the challenge on May 13.

So far, the event has raised nearly £60,000 for GNAAS which is often called to rescue casualties in the forest that an ambulance might not be able to access.

Jim Entwistle, of GNAAS, said the event was fantastic but more volunteers were needed to make sure the event went ahead.

He said: "We desperately need help with marshals for the event and the more the merrier. The even could not be run without the support of volunteers and we want to say a big thank you to all those who make it possible."

The Beast costs £30 to enter and camping will be available the night before as well as entertainment.

Registration will be from 7am before the ride begins at 09.30am.