Sara is a woman approaching middle age who is popular and successful - she's a veterinarian so skilled that she can spay a tortoise using just one hand - but has a chink in her armour: she's afraid to tell her parents that she is a lesbian. So on the eve of her 40th birthday, friends Jamie and Justine give Sara an ultimatum - either tell her parents next time mum and dad visit or they will.

• Sue Perkins
• Shelley Conn
• Nicola Walker
• Joanna Scanlan
• Steve Oram
• Dominic Coleman