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.

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    What title do you have on your driving licence? – MJeffryes Jul 26 '18 at 17:20
  • What country is this? Doctor is a courtesy title in some parts of the world. – mdewey Jul 26 '18 at 17:23
  • This has happened in Spain, Switzerland, and the UK – dothyphendot Jul 26 '18 at 17:29
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    My driving license says Dr – dothyphendot Jul 26 '18 at 17:29
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    Are you wearing a white coat and a stethoscope when you go through passport control? – Sneftel Jul 27 '18 at 6:40