25 years ago, for the most part, the height of coffee culture in the UK were the glamourous couples in the nescafe Gold Blend advert, or perhaps Maxwell House. Granulated coffee that you made with boiling water and throw in some sugar and milk from the fridge.
Then an American "sitcom" (the -com bit is debatable) showed characters in a social location a bit like a pub, but not drinking alcohol. A coffee shop. (Note, this differed from a traditional UK 'cafe' that may be closer to a US 'diner' in that it served hot filling food but rather than a waitress patrolling with a coffee jug it had a big silver boiler for instant tea).
Soon these coffee shops sprang up in every high street, shopping centre and retail park. Soon they spawned branded machines so that even backstreet petrol stations could offer their wares. It's got to the point where even the likes of Maccy D's offer a perfectly adequate cup of coffee.
In trendy places (London), this even took off as people started wanting different exotic varieties. Almost like the tobacco shops of old.