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 Annabelle Apsion as Ellen Barker Peter Capaldi as Laurence Barker Ronan Vibert as Giles Armitage Sara Stewart as Carolyn Armitage Michael Fitzgerald as Francis Crawford Patrick Drury as Connor Simpson John Cording as Sam Judd Scott Handy as Stephen Latimer John Shrapnel as Leo Clarke
