You have to have registration with the General Medical Council/General Dental Council as appropriate.
Registration with the GMC is usually obtained through:
a) sitting the PLAB exam
b) through having a recognised higher qualification such as MRCP.
You will have to obtain an IELTS result of 7.5 in each area or more
Registration can also be obtained through “Sponsorship”, or through having your experience as a Consultant recognised to be equivalent to the UK requirement, but both these routes are uncommon