Wall of Fame star David Walliams nervous about his latest charity challenge!

David Walliams (Wall of Fame Sky)

Wall of Fame star David Walliams has revealed his fears about a new charity challenge. The former Little Britain star has previous swam the channel and taken part in a 24 comedy panel show, but this year is set to go further - swimming the length of the River Thames! David will spent days swimming much of the 200 mile river for this year's Sport Relief.

He told Buzz magazine this week: “I may need a line tied to me as after four days the currents can easily pull you under... that might please some people, but I’d like to survive it.”

He is, quite literally, getting cold feet.

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