Emilia Fox Dr. Nikki Alexander Actor William Gaminara Professor Leo Dalton Actor Tom Ward Dr. Harry Cunningham Actor William Armstrong Actor Sam Parks Actor Ruth McCabe Actor Ruth Gemmell Actor Jaye Griffiths Actor John McGlynn Actor Clare Higgins Actor Janice Acquah Actor Matthew Steer Actor Richard Huw Actor Nicola Redmond Actor Milo Twomey Actor Doreen Hepburn Actor Mick Ford Actor Chris Wilson Actor Ian Keith Actor Arsher Ali Actor Mark Benton Actor Christine Tremarco Actor Tony Pitts Actor Simon Kunz Actor Charlie Creed-Miles Actor Steven Harwood-Brown Actor Roy Sampson Actor Barbara Flynn Actor Keith Bartlett Actor Antony Byrne Actor Sean Baker Actor Samantha Seager Actor Peter Charlton Actor Richard Signy Director Renny Rye Director Michael Crompton Writer Nigel McCrery Writer Laura Mackie Executive Producer Jessica Pope Executive Producer Anthony Byrne Director Richard Burrell Producer Richard Davidson Writer Dudi Appleton Writer, Director Jim Keeble Writer Phillippa Giles Executive Producer