A recent overall score of 7.5 is the minimum required in the academic version of the International English Language Testing System (IELTS).
Doctors must achieve no less than 7 in each of the four areas of reading, writing, listening and speaking. The majority of doctors who have to demonstrate their knowledge of English Currently do so by achieving the required scores in the academic version of the IELTS test. IELTS is an objective method of demonstrating proficiency in English and is widely accepted by many employers, regulators and Professional bodies.
Source: GMC