It's Bathroom Week, and the semi-finalists take on the infamous toilet challenge. Who'll take the plunge for a place in the final, and who'll be left with that sinking feeling?

Siobhan McSweeney hosts a festive special as Babatunde Aleshe, Martin Kemp, Rachel Riley and Tom Rosenthal take to the pottery studio to see who can make the best hand-built Winter Wonderland and throw the most festive wine coolers to impress judges Keith Brymer Jones and Rich Miller.