I got my licence severall years ago, but thats another story. Here is the general proceedure as best as i can remember!

For this series you need a ‘National B race licence’ from the MSA (part of the RAC that represents the FIA in the UK) that costs £45.

Your first step is to buy a starter pack from the MSA for £49. This contains the legendary 'Blue Book' from which all regulations come, a video showing basic techniques, safety info and various other bits of useful gubbins.

You will need to get a medical so they know you will survive your first lap! This includes a basic eyesight test, much like your driving test, and a check that you can get out of your seat without falling over.

Then you have to do a simple training day at a racetrack and pass a test. This is the Association of Racing Driver Schools (ARDS) the course. This is compulsory but well worth doing and actually an enjoyable day out. You learn basic track skills on the circuit in one of their cars and more importantly how to be safe.
Then you do a simple multiple-choice test that checks you know what to do in an emergency and that you know what the flags mean. When you’re finished the instructor will sign your paperwork and you can go home smiling with a few stories to tell your chums.

That done, you post off your forms and test certificate (a bit like when you did your driving test) sit back and wait excitedly for the posty to deliver your shiny new race licence.