Guest Stars Cush Jumbo as Lois Habiba Peter Capaldi as John Frobisher Katy Wix as Rhiannon Davies Nicholas Farrell as Brian Green Luke Perry as David Davies Lucy Cohu as Alice Carter Ian Gelder as Mr Dekker Susan Brown as Bridget Spears Julia Joyce as Holly Frobisher Madeleine Rakic-Platt as Lilly Frobisher Bear McCausland as Steven Carter Liz May Brice as Johnson Hilary MacLean as Anna Frobisher Rhodri Lewis as Johnny Davies Aimee Davies as Mica Davies Paul Copley as Clemet McDonald Gregory Ferguson as Young Clem Ben Loyd Holmes as Operative Charles Abomeli as Colonel Augustus Oduya Rachel Ferjani as Parliamentary Secretary Christopher James as Press Officer Scott Bailey as Father Melanie Barker as Mother 2 Rik Makarem as Dr. Rupesh Patanjali Phylip Harries as Water Taxi Man Crisian Emanuel as Mother Anna Lawson as Nurse