Plot: Tess Daly and Claudia Winkleman present the annual special, which sees singer Nicola Roberts, DJ Rickie Haywood-Williams, podcaster Rosie Ramsey, actor Larry Lamb, CBBC presenter George Webster and former Corrie star Alexandra Mardell perform festive routines in the hope of lifting the coveted Strictly Christmas trophy. There's also a special performance from a ghost of Strictly past - Bruno Tonioli