Guest Stars Jane Wymark as Joyce Barnaby Barry Jackson as Dr. George Bullard Laura Howard as Cully Barnaby Kirsty Dillon as Gail Stephens Sam Hazeldine as Simon Dixon Alwyne Taylor as Dr. Catherine "Kath" Bullard Stephanie Cole as Dorothy Hutton Gareth Thomas as Huw Mostyn David Yelland as Dr. James Kirkwood William Thomas as Bryn Williams Bill Moody as Clifford Rawnsley Nicholas Pritchard as Justin Pickard Elizabeth Conboy as Harriet "Hattie" Tydyman Nigel Betts as DC Briars John Lightbody as Jason Slater Simon Wilson as Dr. Alan Delaney Sharon Morgan as Delyth Mostyn Jenny Livsey as Megan Mostyn William Ilkley as Foreman Daniel Evans as David Mostyn