You have certainly taken a great decision.But many of the top doctors in India do their post graduation in the UK and have done it from last several decades.
In the UK, the University of Oxford, University of Cambridge, Imperial College London are few of the top colleges in the world for studying medicine.
For doctors, it's relatively easier to get the residency because of the high demand for the professionals. Every year, UK releases list the shortage of occupants.
The procedure isn't complicated, you apply to the university in your final year of studies which increases your chances to get a scholarship also. It is required to give entrance exam as well.
The 2 primary entrance exams for studying medicine in the UK are UKCAT and GAMSAT. Both are different from one another.
Oxford and Cambridge use BMAT and Exeter & Plymouth use GAMSAT. There are some universities where they don't ask for these exams also.
UKCAT is an online based test which includes 5 sections: Verbal Reasoning, Quantitative Reasoning, Abstract Reasoning, Decision Analysis, Situational Judgement Test.
GAMSAT is a paper-based test: Reasoning in the Humanities and Social Sciences, Essay writing/Communication and Reasoning in the Physical Sciences.
Oxford and Cambridge use BMAT and Exeter & Plymouth use GAMSAT.
Preparation for these exams can be time-consuming, it's best to start a year before.
All the best to you.