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You are correct that the British 405 line system was eliminated in the 1960s, and that 405 line sets aren't compatible with the new 625 standard, while in the U.S. the 525 postwar standard would work on prewar 441 line sets. However, I don't think this is a factor in explaining why there are more surviving American sets. All prewar sets, American or British, were obsolete immediately after the war because their screen sizes were so small, their pictures so small, and their reliability so poor. I can't imagine a prewar set being kept working past the early 50s at the latest.
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