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