We remember Mrs Thatcher’s concern with the rising costs of the weekly shop better – partly because it wasn’t so long ago, and partly because she was more than happy to be photographed with plastic bags, showing how much less could be bought for the same price under a Labour government. But we shouldn’t forget that some of the most effective party election broadcasts ever seen in this country were those that helped her predecessor into power: spliced between vox pop moans about how difficult it was to make ends meet were spoof ads showing a frozen wage packet and a pound note being snipped away by a pair of scissors. Meanwhile, a Tory poster, which claimed "Labour’s let you down. You’d be better off Conservative", showed an outsized open purse, inside which was tucked some miniaturised money.