Guest Stars Tallulah Fox as Sarah Beatty Fifi Fox as Sarah Beatty Tuppence Middleton as Vicki Walmsley Emily Joyce as Jane Grace Sanjeev Bhaskar as Kanan Dutta Beatie Edney as Justine Skinner Neil Stuke as Professor Andrew Crane Catherine Steadman as Polly Beatty Lesley Vickerage as Katherine Dutta Adam Wadsworth as Joshua Grace Dominic Mafham as Frank McLean Marty Cruikshank as Woman Interviewee Edwin Thomas as Reuben Beatty Suzette Llewellyn as Susan Smith Carol Harvey as Mandy Uncredited Kirsten Foster as WTC Stapleton Hermione Gulliford as Lucy Sopher