 Helen is fobbed off with secretarial work on her first full day at the Work Experience. Missing crisps in the stock room are increasing Mr. Griffiths determination to catch the mystery person hiding overnight in the school. He thinks it is Tegs, but Justine has persuaded him to return to the care home. Trevor, spied on by Matthew and Clarke, seems to be back to his old ways, hoarding beer in his locker. Gonch and Mandy introduce the idea of the end of term American prom to Mrs. McClusky. In the meantime, Ziggy and Robbie are planning to cash in on the idea by a computerized dating service to match partners for the event. At lunchtime, Helen is pleased to be told she will be working on the shop floor - but Neil, who is told to show her the ropes has a chip on his shoulder about working with a mere girl. There s a surprise in store though in the canteen, when she bumps into "Francis" - Mauler no less, on his own work experience. Mr. Bronson tells Mrs. McClusky that he is going to take early retirement, and it is time for her to tell him what she really thinks of his non-supportive methods. Gonch and Mandy get Robbie to be their guinea pig in their computer dating trials and find him the perfect match. Armed with a new bike alarm, Matthew and Clarke follow Trevor to the off-license, thinking he is going to buy more booze - but in fact he s trying to sell some of his stock back, without success. They follow him to the canal, where he tries to pour it away. As he does this, he is accosted by lads who are horrified at the sacrilege of chucking away good beer. Matthew and Clarke find Trevor tied to the bridge without his trousers, which are themselves attached to the bridge. Just as Clarke is untying Trev s trousers, they hear the bike alarm go off, and what s more, the thief is accompanied by the Alsation that gave them so much trouble before. Trev s trousers fall into the canal, but at last there is hope that the dog will lead them to the person who keeps taking the bike!