Guest Stars Jane Wymark as Joyce Barnaby Barry Jackson as Dr. George Bullard Laura Howard as Cully Barnaby Alwyne Taylor as Dr. Catherine "Kath" Bullard Peter Capaldi as Laurence Barker Annabelle Apsion as Ellen Barker Sara Stewart as Carolyn Armitage Scott Handy as Stephen Latimer Ronan Vibert as Giles Armitage Patrick Drury as Connor Simpson Michael Fitzgerald as Francis Crawford John Cording as Sam Judd John Shrapnel as Leo Clarke