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.

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

In this episode, 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. Will Justin's expert advice give them the results they really want? Justin also takes Secret Shopper to the party capital of Liverpool to help one of the city centre's oldest fancy dress shops: Lilli Bizarre. Plus, industry insiders explain how to get more bang for your buck.

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? And turns secret shopper to help one of the country's oldest coach firms, whose trips are so undersubscribed they have to cancel nearly half of them.

Would you have the confidence to walk into a designer boutique and ask for money off an impressive frock? 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 gives Jan a crash course in how to haggle thousands of pounds off the asking price when buying a car. He also goes undercover in The Dollshouse, run by glamourpuss Cat and her pal Mark, who need some help with their sagging bottom line. And Which? reveals some raw deals at the supermarket with our recommended five a day.