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?