If you are an overseas doctors applying to live and work in the UK you must hold a visa issued by the UK Border Agency (UKBA). There are many different types you could potentially apply for, however the Tier 2 visa is the most likely to be relevant for doctors wanting to work in the UK.
This gives you permission to enter the UK and start to apply for other necessities such as a GMC registration. It can also be extended to include your spouse and family if needed.
We use the services of an approved immigration advisory service who will assist you in the collation and processing of your visa documentation. There is no excess charge for the use of this service, you will only be required to pay the Visa fee itself
For full information regarding the different types of visa please see the main UKBA site