Guest Stars Geraldine James as Caroline Matteson Richard Durden as Oscar Matteson Adeel Akhtar as Billy Christine Bottomley as Mandy Jo Martin as Parole Officer Janice Lizzy McInnerny as Norah Boback Imogen Gurney as Lara Adrian Edmondson as John Boback Keir Charles as Mark Charlie Rix as Phil Solon Heather Coombs as Amy Sophie Black voices Meditation Voice Tara Divina as Dr Leila Joshi