Two Pints of Lager and a Packet of Crisps - Season 4 Episode 5

Rather than go to the graduation ball, Louise throws her own party with Janet, taking charge of the guest list. She invites Jonny and Kate, feeling that Jonny has become a nicer person since going out with her, though everywhere everybody looks Jonny and Kate seem to be at it. The party is no exception; Kate goes out of her way to spite Janet by sleeping with Jonny in her bed. Gaz feels guilty about two-timing Donna and ends up back with her, having written her essay for her.