Channel 4 debuts its very first Great British Bake Off tonight following the show's controversial move from its long-term home on the BBC. While there will sadly be no Mary Berry or Mel and Sue, GBBO alumni Paul Hollywood will be returning and will be joined by presenter Sandi Toksvig, comedian Noel Fielding and restaurateur Prue Leith. The series begins with Cake Week, and sees the bakers take on a fruity signature challenge. Next, Prue sets her first technical - a children's tea party favourite - and everyone is out to impress the new judge. Their final task sees the trickiest showstopper ever set in the first week of Bake Off - an illusion cake - whatever that is.