Mr Ravilious spent part of the challenge running by himself

Rob Ravilious set off on the 106-mile (171km) run in Winchester, Hampshire, on Saturday, arriving at Eastbourne, East Sussex, 32 hours later.

Mr Ravilious, from Guildford, Surrey, wanted to raise awareness for the Naomi House children's hospice in Winchester.

He told BBC News: "I've just had champagne to celebrate and it's gone straight to the head."

The runner said he was going to jump into the sea at Eastbourne to cool off.

I'm going to take a lot of cold baths and painkillers Rob Ravilious

"I was absolutely fried towards the end. It was an excellent experience, but possibly not one to be repeated," he said.

"When I get home I'm going to take a lot of cold baths and painkillers and elevate my legs, as I have to get ready to go to France on a motorbike holiday with my girlfriend on Monday."

Mr Ravilious completed his challenge despite suffering an ankle injury and losing his original running partner after seven hours.

Gordon Elliot, from Sawbridgeworth, Hertfordshire, abandoned the run after suffering fatigue and an inflamed ankle.

Annual event

Mr Ravilious was joined later on Saturday by his friend and fellow runner Chris Miller, 37, from Oxford, who ran with him for the final 35 miles (56km).

Mr Miller, an account manager for a coffee company, said: "I'm tired and a bit sore, but better than Rob considering he did the whole thing."

The three ran unsupported and carried their own clothes, water and food supplies.

Mr Ravilious - who had tried the course once before but failed - now plans to organise a South Downs Way non-stop run as an annual event for other runners in aid of Naomi House.