Dressed up as boys for drama, the girls get mistaken for boys by Mrs Griggs in the corridor afterwards and are horrified to be pushed by her into the boys' changing room. When they overhear the boys in there gossiping, Jas decides Lily should continue to disguise herself as a boy in order to get closer to Matt and find out his true feelings towards her.

Mrs Griggs is obsessed by a phone app game called Sweetie Swap. She locks herself in the girls' toilets to get some privacy and ends up blocking the toilet when she drops the phone in there by mistake. Mrs Rennison sets about finding the culprit and is alerted to a CCTV photo of the suspected phantom toilet blocker - it's a photo of Lily dressed in her boy disguise. While Mrs Rennison tries to track 'him' down, Mrs Griggs is desperate to get her phone back from Mrs Rennison to avoid detection herself. When she does eventually get into the cupboard where her phone is kept she gets locked in. When Mrs Rennison, the girls and Ollie find her in there hours later - still playing Sweetie Swap - they realise they've found their culprit!

Meanwhile, Ollie is without his contact lenses and having to wear a pair of embarrassing old children's glasses. He tries to avoid wearing them and, semi-blind, doesn't recognise Lily dressed as a boy. He happily strikes up a friendship with Lily's alter ego 'Liam'. Show less