The Great British Bake Off, often referred to as simply Bake Off or GBBO, is a BAFTA award-winning British television baking competition first shown by BBC Two on 17 August 2010. The judges are cookery writer Mary Berry and professional baker Paul Hollywood. Mel Giedroyc and Sue Perkins have presented all five series of the programme to date. The competition selects from amongst its contestants the best amateur baker. The programme was moved to BBC One in its fifth series after it became the most popular show on BBC Two. Its increasing popularity is credited with reinvigorating interest in baking throughout the UK, Many of its participants, including winners, have gone on to start a career based on bakery. The winners are Edd Kimber, Joanne Wheatley, John Whaite, Frances Quinn and most recently Nancy Birtwhistle. The programme has spawned a number of specials and spin-off shows – a celebrity charity series in aid of Sport Relief or Comic Relief, Junior Bake Off for young children (broadcast on the CBBC channel), and An Extra Slice aired on BBC Two after the Bake Off series was moved to BBC One. Its format was also used on the BBC Two series The Great British Sewing Bee. The format has been sold to many countries around the world where local versions of the show are produced.