It's the quarter finals of Strictly Come Dancing and the pressure is mounting. The four remaining couples must perform two different dances in a bid to stay in the competition. With the final in sight no one wants to leave now. Casting their critical eye over the performances are Judges Len Goodman, Alesha Dixon, Craig Revel Horwood, Bruno Tonioli and, joining the team from this week, ballet legend Darcey Bussell.