Lewis Pugh - the hardcore swimmer who has completed long distance swims in the Arctic and Antarctic, as well as all the major oceans, pitched up on the doorstep of the UK's Prime Minister, Tony Blair, today.

Lewis, who is currently swimming the 320km length of the river Thames as part of a WWF climate change campaign, had a five minute chat with Blair, before presumably jumping back into the water. Rather disappointingly, he seems to have turned up for the meeting in a t-shirt, rather than dripping wet!

BBC: Swimmer stops off at Downing St »

WWF: Thames Challenge »

Lewis Pugh website »