Mark Billingham, also known as Billy puts the celebrities through their paces as the Chief Instructor on SAS: Who Dares Wins. The hit Channel 4 show will kick off tonight (Tuesday, 26 September) as we watch a string of famous faces take part in the punishing jungle phase of SAS selection. Some of this year's celebrities include former Health Secretary Matt Hancock, singer Gareth Gates, TV personality, Danielle Lloyd and TOWIE star James 'Arg' Argent.