On 16 March 1992, Labour’s Shadow Chancellor John Smith arrived at the Institute of Civil Engineers in Westminster for a piece of political theatre that would pass into legend. In front of an audience of journalists and businessmen, Smith delivered a ‘Shadow Budget’ speech setting out the tax and spending plans Labour would pursue if it won the forthcoming election – an innovative gambit designed to counter Conservative accusations that the party would hit voters with a £1,250 ‘tax bombshell’. At the end of the speech, Smith crossed Great George Street and posed on the steps of the Treasury with mock budget documents, including a distributional analysis which showed that eight out of ten taxpayers (and every employee earning less than £22,0...