Guest Stars Patrick Walshe McBride as Sebastian Brudenell Amber Aga as DI Christina Marlowe Daniel Cerqueira as Lawrence Pross Ace Bhatti as Chester Patterson Joey Batey as Callum Ballimore Nick Moran as Steffan Shiplake Emma Noakes as Maggie Pross Will Thorp as Anton Dukes Hannah Hutch as Iris Swifton Uncredited Kathryn Carmichael as Jill Shiplake