There is a 2 year probationary period for newly qualified drivers under the Road Traffic (New Drivers) Act 1995. 

This probationary period starts from the date the driver first passes their driving test. A New Drivers licence will be revoked if 6 or more penalty points are accumulated before the expiry of the 2 years. The driver then goes back to the position of having a provisional licence and must re-sit and pass another driving test before they can drive again.