Tess Daly is joined by Ronnie Corbett and Claudia Winkleman to present the popular dance competition, which steps up a gear as the remaining couples head back to London to take to the dance floor, performing either a ballroom or Latin dance.The eight couples will hope to impress the judges and book a place in the next show. There are only seven places up for grabs, so no-one can afford to put a foot wrong.The two couples with the lowest combined judges' scores and viewers' votes face the dreaded dance-off. Their fate then lies in the hands of the judges - who will stay and who will go?While they wait for the result, the professional dancers provide entertainment with a sizzling performance.