Justin's Secret Shoppers

Justin gives Jan a crash course in how to haggle thousands of pounds off the asking price when buying a car. And Which? reveals some raw deals at the supermarket with our recommended five a day.

Justin helps two label-loving ladies haggle money off just such a frock. Three streetwise London cabbies hit London's hi-fi stores looking to bag a bargain. Justin goes undercover at a second hand car dealership in need of a jump start.

Justin helps a soon-to-be wed couple get the deal of the century, saving thousands of pounds on their dream kitchen. He explores fixed-rate mobile phone tariffs with the team at Which?

Justin helps a couple who are up from the seaside to haggle over the cost of a posh dinner and room in a swanky hotel in the millionaire's playground of Mayfair. It's nerve wracking for them, but they're keen to give it a try.

Justin goes behind the scenes at the winter sale at John Lewis. He also shows how to negotiate deals on a leather sofa and a smart TV.