I have always advised here that travellers wanting to pay for things in the UK with a Discover Card will find it difficult if not impossible to use that card here.
Imagine my astonishment just a couple of minutes ago when I was checking opening hours for my favourite Cotswolds bakery and tea rooms, Huffkins, https://huffkins.com/pages/about-us-cotswolds-bakery-cafe-tea-rooms when I saw the list of cards accepted and Discover was right there with all the others. I know a lot of overseas tourists go to Stow on the Wold and Burford, not to say John Lewis Oxford Street, so demand must have driven change.
Wow.