The drama series continues with the story of Holly (play by Billie Piper), a schoolteacher for-ever destined to be the other woman, stuck in an affair with a married man. Then she strikes up a relationship with one of her teenage pupils - only to realise she sees the girl as more than just a friend. What would happen if she acted upon her feelings? Um, she'd get fired for start-ers. Kaya Scodelario (Skins), Charlie Creed-Miles (Nil by Mouth) and Jenny Agutter (Call the Midwife) co-star. A double bill of the last two stories can be seen tomorrow.