Gregg Wallace and Chris Bavin are in Newport with the Scott-Dent family, who are addicted to freezer food. They are a busy family who hardly ever cook from scratch and are throwing away a fortune in food every week. They desperately need to get their spending under control so that they can save for their first family home.

Kate and Chris have three children under ten, with Chris being stepdad to the oldest two. They both work, and Kate loathes cooking, and with non-existent kitchen skills she finds preparing food too much of a chore. She has a fear of food near its sell-by date and is convinced that reheating it will make her family ill.

To see where the family is going wrong, Gregg and Chris secretly watch them on a weekly food shop - and they make every mistake in the book, buying sliced and grated cheese, pre-prepared fruit and veg and overpriced frozen food. It's time for a reality check, and they're shocked when Gregg and Chris reveal that they are spending twice the amount of an average family of five. Can Gregg and Chris save this family some serious cash and improve the quality of what they eat at the same time?

Chris wants to allay Kate's fear of sell-by dates and investigate just how safe our food labels really are. Kate also believes that butter is better for you than margarine, and Gregg wants to find out if that's the case. Along the way, dietician Lucy Jones gives us the nutritional differences.

Their usual shopping has been replaced and everything is put in plain packaging. Most are cheaper products, some are the same and some are more expensive, to show that sometimes it is worth paying more. The fridge is full of fresh food and the freezer is left practically bare for the first time, but at the end of the week will this family change their ways and embrace Chris and Gregg's changes?

Gregg and Chris are with the Austen family from Sussex, tackling the highest expenditure on food they've ever encountered. Mum Denise has recently had to give up work, which means the family income has reduced by a third, and yet she still raids the supermarket like she's earning her old salary. The family are guilty of stockpiling food to the point where they can't open the fridge door without items falling out. On top of that, they're utterly devoted to high-end brands.

Gregg and Chris spy on the family's weekly shop to discover Denise only buys items she finds attractive, and it's not just glossy packaging she's drawn to, but also premium-priced, premium-packaged fruit and veg. The boys are further aghast when they get back to the Austens' home and chance on the nine jars of jam in the kitchen. This is a family who desperately need to change their habits and save some serious cash.

As well as opening the Austens' eyes to tasty lower-cost products, the show features blind taste tests with the British public on mayonnaise and jam. Another of Denise's weaknesses is for sugary drinks, so Chris visits Manchester Dental Hospital to look into the impact of fruit juice, milkshakes and other soft drinks. Meanwhile, Gregg goes on the hunt for affordable cuts of meat. The show's advice is often that meat is a product worth spending money on, so Gregg wants to look into more unusual, lower-priced alternatives to costly prime steaks.

When Gregg and Chris return to Sussex for the final time, they're anxious to find out whether the family will agree to be prised from their top-end purchases. Theirs may have been a record food spend, but will it be a record saving for the boys, or will the Austens revert to their old ways?