Boomers made that bland war time food linger. They were children during and just after WW2 so it was part of their childhood nostalgia and they fed it to their own kids. Also we’ve had Indian/ Chinese restaurants in the UK for a while but they were mostly just in major cities at first so the average person still had little exposure to foreign or exotic food until the late 1970s/ early 1980s.
Good point. But rationing continued in the UK until 1954 so it did affect them.