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 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 shows a couple that brilliant travel deals can still be had in high street travel agents.

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.