Special Guest Stars Ṣọpẹ́ Dìrísù as Sean Donovan Guest Stars Rosalind Eleazar as Louisa Guy Saskia Reeves as Catherine Standish Christopher Chung as Roddy Ho Chris Reilly as Nick Duffy Aimee-Ffion Edwards as Shirley Dander Kadiff Kirwan as Marcus Longridge Christopher Coghill as Hobbs Samuel West as Peter Judd Eliot Salt as Sarah Dunn Charlie Rowe as Ben Dunn Naomi Wirthner as Molly Doran Nick Blood as Sturges Sion Daniel Young as Douglas Gavin Spokes as Sly Monteith Co Starring Hywel Morgan as Steve Johnston Lucy Aarden as Chieftain Receptionist Robert Irons as Club Concierge