Ross Kemp has reportedly signed for The Celebrity Traitors and is set to join Claudia Winkleman in Ardross Castle in Scotland for filming this weekend. The actor and documentary-maker, 61, is best known for playing Grant Mitchell in the East London soap and now has decided to set his sights on a new challenge. This comes as a surprise move from the star who has refused other reality TV show competitions, but reports suggest he was intrigued by the "psychological" nature of The Traitors. An