What a pain it must be to be in charge of the nation's finances in these challenging economic times. It's easy to imagine the Chancellor, Alistair Darling, working feverishly into the night in a frantic attempt to make the sums at least appear to add up as he prepares for tomorrow's crucial pre-budget report. But what to cut when everything is a 'tough choice' - education, the NHS, or the unthinkable alternative - raising taxes?