Guest Stars Will Poulter as Colin Ritman Asim Chaudhry as Mohan Thakur Craig Parkinson as Peter Butler Fionn Whitehead as Stefan Butler Tallulah Rose Haddon as Kitty Rochenda Sandall as Pippa 1st AD Sandra Teles as Reporter Fleur Keith as Mum Alice Lowe as Dr. Haynes Laura Evelyn as Pearl Ritman A.J. Houghton as Young Stefan Suzanne Burden as Judith Mulligan Jonathan Aris as Crispin Ellie Piercy as Receptionist Alan Asaad as Satpal Catriona Knox as Leslie Stephen Rashbrook voices Narrator Jeff Minter as Jerome F. Davies Tom McCall as Paramedic Jon-Jo Inkpen as Pax Paul Bradley as Robin
