With global inflation and cost of living rates currently rocketing at unprecedented levels, you don’t get much for your hard-earned £2.50 these days. £2.50 might just get you a litre of diesel fuel at a motorway service station, half-a-pint of lager (if you’re lucky), a pasty or a three pack of Heinz Baked Beanz at your local supermarket. If you look hard enough, though, you might just be lucky enough to find an interesting second-hand car book in a charity shop for the same amount, as I did last weekend.