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phil gollin
All MDs are Doctors - because they have Doctorates - although these are not ever so common in the UK
Medical Practitioners in the UK usually have either MB BS or MB ChB degrees - Bachelor of Medicine and Bachelor of Surgery and use the honorary title of Dr - it applies to Dentists now who are also authorised to call themselves Dr
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Most UK medical doctors are "professionally" doctors - and hence use the title as a professional name, e.g. like saying someone is "plumber" smith or "electrician" Jones.
Relatively few have proper academic doctorates.
Another group which is peculiar are the police, where each and every policeman has a warrant, but their "job titles" are merely job titles.
It is all about trying to impress someone else - especially with the police who wouldn't want a member of the public to address them on frst name terms - just try matching name useage "one-to-one" with a policeman - always fun, it gets you back to the "Mr" stage really quickly.