Guest Stars Kevin McNally as Professor Peter Cherry Maeve Courtier-Lilley as Vanessa Miller Kaye Wragg as Valerie Fullerton John Thomson as DI Warren Bull Emily Piggford as Professor Elizabeth Newport Diveen Henry as Elaine Robinson Ashley Margolis as Haidar Alam Richard Keep as Harrison Cairney Isobel Wood as Celeste Locke James Craze as Roy Harry Lister Smith as Homeless Man Julie Jupp as Woman with Dog
