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?

Gregg and Chris come to the aid of the Guest family from Loughborough, whose diet of beige convenience food is not only unwholesome - it's also frighteningly expensive. Mum Lisa is desperate to make her family healthier but is going about it in all the wrong ways, buying into costly superfoods rather than good old-fashioned fruit and veg.

As Gregg and Chris spy on the family's supermarket shop, they're astonished to see the couple haphazardly throwing anything beige that catches their eye into their shopping trolley, and realise they need a serious wake-up call.

Learning that your food bills are actually 50 per cent higher than you thought they were would reduce anyone to tears, and Lisa Guest is no exception, shocked to the core when Chris delivers the bombshell. But in order to save money the family have to agree to cook more, change their diet, eat more veg and accept some low-cost products - will it prove a step too far?

In between bringing colour to the Guests' dinner plates, Gregg and Chris look into how cost-effective canned fish compares to fresh, and which oil we should be cooking with, as well as what diet cons not to fall for. They offer up delectable budget-friendly recipes, from chickpea-based pizza to a Moroccan spiced casserole that provides your entire recommended five a day in just one serving.

Will the Guest family agree to banish their beige convenience food in favour of veg-filled, home-cooked meals? And will they manage to slash a decent chunk off their very hefty shopping bill?