Claudia Winkleman and Tess Daly reveal the two couples who have the lowest combined judges' score and viewer vote, and must go head to head in a dance-off to decide which of them will be eliminated from the contest. Plus, a performance by Gladys Knight, singing her 1989 James Bond theme song Licence to Kill, and a group performance from the professionals with a very modern take on the all-time classic Singin' in the Rain.