Guest Stars Jamie Sives as Karl Mortensen Risteard Cooper as Si Robertson Karl Johnson as James de Cadenet Nina Wadia as Dr Anita Rhys Evans Chizzy Akudolu as Addy Smith "The Squeak" Thea Barrett as Polly Isabelle Mullally as Annie Eileen Davies as Julia de Cadenet Henry Helm as Josh 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