Guest Stars Geraldine James as Caroline Matteson Richard Durden as Oscar Matteson Adeel Akhtar as Billy Christine Bottomley as Mandy Jamie Michie as Dom Imogen Gurney as Lara Liam Williams as Nathan Juliet Cowan as Tina Frank Feys as Samuel Souad Faress as Anna Charlie Rix as Phil Solon James Bradwell as Junior Pharmacist