The Bake Off returns for four special Sport Relief programmes. In each episode there are four celebrity bakers facing three challenges set by Mary Berry and Paul Hollywood, each hoping to win the Sport ReliefStar Baker apron. This time the tent has four different hosts to coax the bakers through their challenges: Sue Perkins hands over the baton to Jo Brand, then to Omid Djalili and finally Ed Byrne.Sue Perkins hosts the first episode, in which cricketer Michael Vaughan, James Bond and Downton Abbey actress Samantha Bond, Harry Potter actress Bonnie Wright and broadcaster Johnny Vaughan enter the tent. For the signature challenge they must make sandwich biscuits, for the technical challenge a tarte tatin and for the showstopper a 3D novelty cake, which must represent a sporting landmark.They are baking for Sport Relief to inspire everyone at home to do the same and raise money for those who really need help. Olympic gold medallist Nicola Adams visits South Africa to meet those who benefit from a local community centre offering young people the chance to get off the streets and learn sports, including boxing. She meets Tony and sees first-hand how Sport Relief money can help give children like him the chance to get off the streets. Your donation really can help change lives.