Bear’s Mission With David Walliams

Author and entertainer David Walliams is put through his paces by the former SAS soldier.

As Walliams has swum both the English Channel and the length of the Thames for Comic Relief, he’s a pretty tough character underneath his larger- than- life showbiz persona, but Grylls has a few challenges in store to test the BGT judge to the limit. Tuesday, STV, 9pm