system
A chat on subreddit /r/NoStupidQuestions
human
Time of economic rebuilding after the war created a generation of people that grew up on more utilitarian food, and they generally didn't mind it. It took the kids growing up after them and without the hardships they faced to feel the desire to change things up.
gpt
Traditional British food had a golden age from Victoria to the onset of WW1 - particularly amongst the upper class. The quality of British produce was (and is) fantastic - see Downtown Abbey for an obviously glamorized but not too far-fetched take. Think fantastic roast meats, game, cold-water fish and seafood, pastries, pies, cakes, seasonal veg, cheeses, sausages.

Both wars drastically cut relative wealth &amp; prosperity and rationing finished off the nation’s collective culinary mojo. It’s only been rediscovered and reinvented in the last 20 years and further enhanced with world cuisine influences. Think of all the chefs on ‘Great British Menu’…delicious!