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 Eliot Salt as Sarah Dunn Charlie Rowe as Ben Dunn Nick Blood as Sturges Sion Daniel Young as Douglas Max Bennett as Fenwick Co Starring George Smale as Rafer - Chieftain Security Anthony Kaye as Mackenzie - Chieftain Security Adam McNamara as Valentine - Chieftain Security Jamie Maclachlan as Donald - Chieftain Security Philip Cairns as Gus - Chieftain Security