I accept your point about the approach being consistent.When I wandered round the supermarket, I was appalled to find that, applying the notional MPU of 45p—although I also did it with 50p, 55p and 60p—the minimum price of vodka was 37 per cent above the amount that it is currently sold at. Vodka was £7.96 a bottle, compared with the £12.60 that it would ha...