AN EXTREME adventurer has completed the world's longest triathlon which started and finished in Lulworth.

Sean Conway, 35, swam, pedalled and ran nearly 4,200miles over 85 days around mainland Britain, cycling 3,200miles on a bamboo bike from Purbeck to Scarborough, then running 800 miles to Brighton and swimming 100 miles back to Dorset, arriving on Friday, June 24.

He said that one of the toughest challenges he faced during his mission was to find the 5,000 calories each day to keep him going. He ended up eating wild garlic leaves, dog treats and even liquidised roast dinners and recently caught mackerel by attaching a fishing line to his homemade raft which he named Rafty McRaftface.

Sean added: "This has been, without doubt, the hardest thing that I have ever done. My body feels broken and I’ve lost all my body fat as a result, but it has all been worth it. The support from the public has been incredible and has kept me going. I can’t thank you all enough.

"People sometimes underestimate how amazing Britain really is, and let me tell you, having circumnavigated it, this really is a beautiful island that we live on."

Sean, who descends from Zimbabwe, had to carry out the mission totally unsupported and carried all his kit including his tent, for the entire distance. He also kept supporters updated via social media by posting video blogs and pictures to fans online, with more than 7,000 posts reaching over four million people on Twitter, Instagram and Facebook since the middle of March. People could also track his progress online through the use of GPS technology.

The trip was filmed by the Discovery Channel along the way for a three-part documentary entitled Sean Conway: On The Edge which will be aired from August 31st.

It aims to reveal the great lengths that Sean went to so that he could make history including averaging more than a marathon a day across 33 days in his running shoes.