@bytebro
And warrant officers are 'Mister' or 'Miss' or 'Mrs' to their superiors.
What you're talking about is specific to the U.K. and the peculiar history of surgeons in the U.K. that dates back to the days when monks were banned from performing surgery in the 12th century and barbers took over.
It didn't carry over to the U.S.A., several people have suggested that it is anachronistic in the U.K. because surgeons are not relatively unqualified nowadays, and in Australia for one the RACS exchanged 'Mr' for 'Dr' half a decade ago.
https://rcseng.ac.uk/patient-care/surgical-staff-and-regulation/qualifications-of-a-surgeon/#Why
https://link.springer.com/chapter/10.1007/978-3-642-57282-1_1
https://canberratimes.com.au/story/7344494/surgeons-move-away-from-mister-is-overdue-but-welcome/
#titles #medicine #professions