Barry's behaviour finally makes Sian snap. With Sian's teaching career on the line, can Michael and the school save her? Elsewhere, Christine discovers Connor and Imogen are engaged, Kevin and Chalky's new phone app causes a stir and Scout's mum makes an unwelcome return.

Lula disapproves as a new pupil tempts Harley to behave out of character with disastrous consequences. Lorraine makes a surprise announcement, whilst Grantly struggles to keep his illness under wraps. Maggie proposes a solution to his problem. But will she be able to go through with it?