Originally Posted by
M60_to_LGA
As I understand it, the downfall came with the advent of canned food and industrialization, and was cemented by the deprivations and rationing of WWII and the postwar era.
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British fare is fairly simple and can be good even if it is simple. However, in addition to the above, there was an air of indifference by some restauranteurs, as well as boil-in-a-bag type food all to prevalent.
Nigel Slater's Toast is an interesting recollection of this era.