Stompa wrote:compared to larger stores (which IME [almost?] always accept small card transactions).
Although you occasionally see small shops with a "no cards below £x" sign, in my experience the national retailers have always been happy to take a card payment no matter how small; smallest so far, 5p when I decided that actually I did want a bag.
As for the use of contactless, every Monday lunchtime I wait in an enormous queue in Boots in central London to take advantage of their £1 O2 meal deal. £1 would be an easy sum of money for someone to pay in cash, but over the last year I have yet to see anyone pay other than by card, almost invariably a contactless card.