Guest Stars Caroline O'Neill as Win Thursday Abigail Thaw as Dorothea Frazil Sara Vickers as Joan Thursday Simon Harrison as Ronnie Box Richard Riddell as DS Alan Jago Alison Newman as Viv Wall Sophie Winkleman as Isobel Humbolt Blake Ritson as Gabriel Van Horne Oliver Chris as Dr Elliot Wingqvist Mary Stockley as Hildegard Slayton Benjamin Wainwright as Professor Adam Drake Gabriel Payne as Matthew Humbolt Katie Faye as Christine Chase Sasha Willoughby as Flora Humbolt Sargon Yelda as Dr Larry Humbolt Terenia Edwards as Marilyn Gidby Ross Boatman as Mac Honeydew Charlotte Bradley as Mrs Trellis Robert Hands as Eric Gidby Alice Orr-Ewing as Natalie Wingqvist Michael Parkhouse as TV Anchor Matthew Cottle as Jeff Slayton