I noticed the coffee I always purchase jumped 12.5% in price from a week earlier, it was also upped 8% last December.

Every price comparison article I read that compares the cost of a basket of the same items in four supermarkets - Aldi, Morrisons, Asda and Tesco - always has Tesco as the most expensive at around 10% higher than a virtual tie between Morrisons and Asda and 20% costlier than Aldi.

Are Tesco fans richer or dafter than shoppers who visit the others?