All the volunteers successfully completed the challenge.
At one point, Tree reappeared, claiming to have, in fact, completed the challenge already, without telling the group.
10.33pm: Noirin's eyebrows still seem to be semi-intact, and Big Brother refuses to believe that she has completed the challenge.
Sometimes I do hate getting into it but I know I'll feel great afterwards when I've completed the challenge I've set myself.
Celebrities who have completed the challenge range from former US president George Bush and Cheryl Cole to editor of US Vogue Anna Wintour and footballer Cristiano Ronaldo.
They completed the challenge in just 9 hours!
Cheered every step of the way, he was met by his childhood hero Brendan Foster as he completed the challenge.
Walliams completed the challenge, which has raised more than £1m for Big Splash Challenge for Sport Relief, despite being warned not to swim in the river.
Full-back Sam Tomkins is the world's most expensive player, winger Josh Charnley scored the most tries last season as Wigan completed the Challenge Cup and Grand Final double.
He completed the challenge.
