Recently I read an assertion that the EMI vault "west of London" houses
everything EMI has ever recorded. Despite apparent ambiguity, the
implication is clear: These are masters. Yet I have also read that at some
point (during the war?) EMI lost (or destroyed?) many or most of their
metal masters and called upon RCA Victor in America to resupply them (with
metals? mothers? stampers?). What's the story?