In the UK the core medical degree is MB ChB, the latin acronyms for Batchelor of Medicine and Surgery. Some also take a year out to complete an "intercalated" BSc (=BS).
Advanced specialist training and examination in surgery, gynae or whatever takes place under the auspices of the relevent Royal Collage, so most Brit doctors are not technically doctors at all in the academic sense unless they have also done a PhD which would likely happen only if their career was particularly research focussed.
By convention junior doctors, whatever the specialty, are referred to a "Doctor". You only get to be referred to as "Mister" when you are appointed consultant, which is the top of the clinical career track.
Thanks for the info. I think things are a little different over here in the colonies.