The Great Sport Relief Bake Off

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.

Sue Perkins hands over the baton to Jo Brand to support the next four celebrity bakers through their three Sport Relief challenges. This time the battle is between Desert Island Discs' Kirsty Young, singer andactress Jane Horrocks, Olympic gold-medal winning long jumper Greg Rutherford and ice skating's Mr Nasty, Jason Gardiner.

For the signature challenge Mary Berry and Paul Hollywood have set gingerbread biscuits, for the technical a banoffee pie and for the showstopper a representation of their jobs - in cake. From Kirsty's 'Dessert Island Dish' cake to Greg's sponge sandpit, who will impress and be the one to win the Sport Relief Star Baker apron?

They are baking in the tent to raise money for Sport Relief, and Olympian Nicola Adams travels to South Africa to meet some of the most vulnerable people who your money can help. She meets Mamjiji, a young boy who has been living on the streets of Durban and facing the danger and stigma that goes with it, until he joined a project that gives him a temporary home and teaches him to surf, giving him an identity that he can be proud of. Your donation really does make a difference.

Omid Djalili is host of the Bake Off tent. This time, those facing the judges are Olivier award-winning singer Michael Ball, broadcaster and co-founder of Comic Relief Emma Freud, singer and presenter Jameliaand Olympic gold-medallist Victoria Pendleton. As they warm up for their baking marathon so does the rivalry between Emma and Michael, but only one can win the Star Baker apron.

For their signature challenge they face a traybake, for the technical they must make iced ring doughnuts, and for the showstopper layered cakes which must pay homage to their personal sporting heroes. With a cake the girth of Sir Chris Hoy's thigh, a fondant Jamaican sprint team and an almost life-sized Big Daddy, what could possibly go wrong?

They are baking for Sport Relief, hoping to inspire everyone to raise money for those who really need help. Olympic gold-medallist Nicola Adams visits South Africa to see first-hand the people whose lives have been changed by Sport Relief. Desiree's mum, Priscilla, is HIV positive and they struggle with the ignorance and stigma surrounding the condition. Nicola meets the people trying to educate the next generation, so that they do not have to struggle on their own. Your help really can make a difference.

It is Ed Byrne's turn to take up the baking baton and support the four celebrities as they face their three challenges in the Bake Off tent.

The bakers on the starting line are impressionist Alistair McGowan,Saturdays singer Rochelle Humes, comedian Doon Mackichan and former Blue Peter presenter Helen Skelton, who rowed the Amazon and trekked to the South Pole for Sport Relief. Will her baking prove as much of an ordeal?

The bakers must make pizzas for their signature challenge, eccles cakes in the technical challenge and showstopping tiered cakes that represent sporting equipment.

While the bakers aim to inspire others to raise money, Olympic gold-medallist Nicola Adams visits South Africa to see first-hand how your money is making a difference to those who really need it. She meets Queen, a 14-year-old girl who has been orphaned and must now look after her younger brother. Nicola meets the people who help give Queen, and so many others, the chance to be free to be children again, if only for short breaks within their week. Your money really does make a difference.