Before you are allowed to drive unsupervised you are required to pass two tests. The Theory Test and the Driving Test. However, even before you can take these tests you will need to obtain a Provisional Driving Licence.
You can obtain a provisional driving licence application form from your local instructor, your local post office or by contacting the DVLA direct on 0870 240 0009. You can apply for your provisional car driving licence up to three months before your seventeenth birthday (however, it would not become valid until you were seventeen).
Although you can start your driving lessons as soon as your provisional driving licence becomes valid, you cannot book the driving test until you have passed the theory test. The information has been reproduced here as an aid to anyone learning to drive for their sole private study, See copyright message at the bottom of this page.