Guest Stars Jamie Sives as Karl Mortensen Nina Wadia as Dr Anita Rhys Evans Karl Johnson as James de Cadenet Chizzy Akudolu as Addy Smith "The Squeak" Eileen Davies as Julia de Cadenet Risteard Cooper as Si Robertson Henry Helm as Josh Thea Barrett as Polly Isabelle Mullally as Annie Ariyon Bakare as Dougie Thompson Grace Calder as Savannah Adrian Hood as Kenneth Baines Madeleine Demetriou as Abigail Robertson Delainey Hayles as Billie Stephen McCole as Johnny Hapgood