By Mia O’Hare The Traitors bosses are said to have made a huge signing to keep the show at the top of its success. The hit BBC series is filmed in a Scottish stately home and bosses are so sure of its popularity they have booked it out until the end of this decade, according to reports. Claudia Winkleman has fronted two series of the show so far, which took place at the foreboding Ardross Castle in the Scottish Highlands. Bosses are so sure of the show’s continued success that they have reportedly signed up for another six years in the same location. A TV insider said: “The ultimate nightmare …