BBC Documentary Films

While North Korea's 'Supreme Commander' Kim Jong-Un has been threatening thermo-nuclear war against the United States, Panorama reporter John Sweeney spent eight days undercover inside the most rigidly controlled nation on Earth.

With their price drops, roll-backs, brand matches - as well as that old firm favourite, the two-for-one offer - our leading supermarkets are doing battle for our cash. They claim their price war is good news for shoppers in these tough times, but are their money-saving offers all they seem?

Sophie Raworth takes her trolley round the aisles of Britain's biggest supermarket chains and reveals some nasty surprises at the checkout.