While out shopping at Top-Buys, the Trotters are taken to the supermarket manager's office believing that they have won a prize. Instead, they are held hostage when an armed robbery goes wrong.

Del, Rodney, and Albert are apprehended as shoplifters by an overzealous security guard at the Top Buy Supermarket. And things get worse when they're taken to the manager's office and realise that they've lost their receipt for the goods.

Shortly after, Tom the security guard brings a cocky shoplifter, Lennox Gilbey, into the manager's office, where he promptly pulls out a gun and demands money from the safe.

Unluckily for Lennox, the safe is on a time-lock and due to the dodgy watch he's wearing, he's a good hour later than he planned - and the safe doesn't open again until 8am the next morning.

After being held hostage throughout the night, Lennox realises that he knew Del when he was a kid. By preying on the would-be robber's guilty conscience, Del persuades Lennox to reveal that the plan was hatched by Tom and the supermarket manager to get at the £60,000 stored in the safe.

The three accomplices beg Del not to go to the police, and instead, he arranges for Lennox to get a job as security guard at the supermarket after Tom's impending retirement - he also makes sure he wins a £1,000 prize as the millionth customer in the store.