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@fallen-archie wrote:

The other thing that worried me is this, would the messenger in 1940 not have been a Kings  rather than Queens messenger?

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Perhaps it was. Please see the enclosed link. There is an image of two passports. One marked 'King's Messenger' and the other marked the 'Queen's Messenger'. I assume the latter was employed when Liz ascended the throne in 1952. (Or upon her Coronation in '53).

http://www.passport-collector.com/her-majestys-queens-messengers-history-current-status/