5/6 Investigates the evidence that a tsunami hit the coast of Wales and England 400 years ago. (R)
7/14 The bakers take on three sweet dough challenges. (R)
8/14 The remaining bakers face a biscuit-based quarter-final. (R)
4/10 Ainsley Harriott shows off his sweet side and campaigns for the revival of British honey.
2/3 Exploring the importance of tradition and continuity to the hotel's clientele. (R)
4/5 Michael Portillo makes a spectacular ascent by train to Europe's highest station. (R)
2/4 Simon King and Dave Myers try to make a slimline cooked breakfast which still satisfies. (R)
3/4 The Hairy Bikers are advised to become the Hairy Cyclists to help reach their goal. (R)
3/3 Delving into the world of zombie parasites and the frozen frog that can come back to life.
3/3 Examination of how Victoria's sons struggled to live up to Prince Albert's model of purity
3/3 An attempt to show what it's like braving the baying hordes armed with just a microphone. (R)
Friday 4 January 2013