Paul Hollywood and Prue Leith judge a Christmas special featuring the Baker Ghosts of Christmas Past - one contestant from each previous series broadcast on Channel 4. They welcome Sophie from series 8, Dan from series 9, Amelia from series 10, Linda from series 11, George from series 12 and Carole from series 13 into the tent, before ending their festive celebration with a performance from the Citizens of the World Choir