I'm frequently being asked for advice on how to get a race licence and start racing, so here is a comprehensive guide:
It's not necessary to have any prior track driving experience before applying for a race licence, you can simply take the following steps:
Once you've got your Interclub Race Licence you can start racing. You'll have to decide what you want and can afford to race in. One way of starting is to hire a car. There are many series with hire cars available. Otherwise, if you have the resources (or know someone who can do it for you) you can run your car yourself.
You'll need to join an appropriate club such as the BRSCC or the BARC. They are the two most prominent clubs running race meetings but there are others such as the HSCC, CRSCC, 750 Motor Club and more. You'll really need to join the club that runs the races you're going to do.
When you have a car to race in and you've joined the appropriate club, you'll need to enter the races you want to do. This involves submitting an entry form (many are available to do online these days) and paying an entry fee. The fees depend on what races you intend to enter, but expect to pay between £250 and £400 for most club races.
Having entered a race you will receive final instructions and tickets in the post. The instructions will include the timetable for the race meeting which will tell you when you need to sign on, when you and your car need to attend scrutineering, and when your qualifying session and race(s) are.
At signing on you will need to produce your race licence. Don't forget it or you'll pay a fine (or not race).
At scrutineering Motorsport UK officials will check your car for trackworthyness, safety and that it complies with the regulations; they'll also check that your race suit, helmet, gloves and boots are in date.
When your qualifying or races are due to be run you'll (your race) be called to the assembly area about 30 minutes before. You'll need to be there with your car, in your race kit, ready to go on the circuit, and follow the instructions of the marshals.
Those are the basics. If you would like more information please.