I was probably a bit unfair comparing Jura between the supermarkets without taking account of similar offers, since a bottle of single malt is discretionary spending for most people. I found that a bottle of Singleton is £20 in Sainsburys on a special offer, compared to £30 in Tesco and £32 in Asda and Waitrose.

Fortunately I have a good stock of duty free whisky at home, so I won't need to buy any more for a few years!