Endurance athlete Nick Butter is expected to cross the finish line on his epic two-marathons-a-day, 5,250 mile run around the coast of Britain today at the Eden Project.

Mr Butter is undertaking the gargantuan marathon to raise awareness and funds for The 196 Foundation a non-profit grant foundation championing democratic donorship.

Mr Butter started the run at the Eden Project on April 17 and is due to complete it this afternoon (Sunday).

The endurance athlete previously set a world record for running a marathon in every country in the world. He ranks his latest gruelling challenge as his toughest yet and is about to break another astonishing record - the fastest circumnavigation around the coast of Britain on foot.

He has achieved this despite numerous setbacks, including fracturing his shins, which resulted in a week’s postponement of the run while he recovered on crutches.

Nick said: “It turns out running two marathons a day isn’t just twice as hard as running one marathon a day… it’s far more brutal on the mind and body than I could have ever imagined. However, the incredibly kind and friendly support from fellow runners both in person and around the world has made it a little more bearable.

“Furthermore, the coast of Britain in all its natural beauty has blown me away. Everyone should see more of Britain - I’d recommend the whole coast! We live on a beautiful island. Let’s look after it.”

Nick has had more than 1,200 local runners join him throughout his challenge, who have all had an impact on the expedition.