She's one of the BBC's biggest stars thanks to her role as host of two of the corporation's most successful entertainment series. Now Claudia Winkleman is to stand-in on Graham Norton ’s chat show as host for the first time, two years after making a pilot for her own BBC interview series. The presenter, who fronts hit shows The Traitors and Strictly Come Dancing , will cover for Graham when he’s away doing his live theatre tour in Australia next month. In tonight’s instalment of The Graham