My UK passport doesn't list a title, but often when I go through passport control, the officer will say something like 'Thank you Doctor' or 'Have a good day doc'. How do they know I have a PhD? I'd also like to know what other information they see.
closed as too broad by Giorgio, gmauch, Newton, David Richerby, Willeke♦ Aug 7 '18 at 19:38
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