Both Benny and Trisha are disillusioned with Grange Hill – Benny, because he gets called names like "gollywog" by the likes of Doyle, and Trisha because the rules about uniform are, to her mind, very strict. When Trisha wears nail varnish, Mr. Mitchell wont take any more excuses, and tells her hes going to write to her mother. When the letter arrives, Trisha takes it herself, but she knows she is only delaying the inevitable. On Monday, neither Benny nor Trisha are present at registration, although Benny was seen before school began. Ann knocks on Trishas door at lunchtime – her mother is unaware that Trisha is not at school. Mr. Mitchell overhears Ann and Mary talking, and with Miss Mather taking his tutorial, as he goes out to try to find the lost sheep.

Derek Anders as Mr Parkes
Carole Nimmons as Miss Mather
Michael Percival as Mr Mitchell
Kim Benson as Mary Johnson
Abigail Brown as Judy Preston
Todd Carty as Tucker Jenkins
Robert Collins as Macker
Lucinda Duckett as Ann Wilson
Julia Gale as Carol Yates
Vincent Hall as Michael Doyle
Michelle Herbert as Trisha Yates
Simon Henderson as Peters
James Jebbia as Thomas Watson
Franco Manzi as Robo
Terry Sue Patt as Benny Green
Pamela Vezey as Mrs Yates