Sophie Petzal Creator, Screenwriter, Executive Producer Anna Maxwell Martin Theresa Actor Rachael Stirling Helen Actor Rhashan Stone Fraser Actor Peter McDonald David Actor Ken Nwosu Eddie Actor Amelie Bea Smith Eva Actor Fraser Holmes Ben Actor Jonas Armstrong Gareth Actor Jodie McNee Jean Actor Tia May Watts Georgina Actor Jim Howick DS Robin Parks Actor Kate Morgan-Jones Dr Juliet Rose Actor Catrin Lewis Defis Producer Carolina Giammetta Director Sarah Warne Original Music Jonathan Fisher Executive Producer