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I have read a report that on 11 November 1841, on the occasion of the birth of King Edward VII, there was a dispute between two Guards officers regarding promotion. Apparently, the Captain on duty at St James Palace is promoted to Major when a Royal Child is born. The question arose because birth took place whilst changing of guard was in progress. One officer claimed the sentries had changed and keys handed over. Other denied this fully implemented. Apparently went to court before a Lord Hill.
Anything known about the supposed tradition - did it ever exist, is it still in force?

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