The new drivers act affects drivers that passed their driving test on or after 1st June 1997. If you get 6 or more penalty points on your licence within two years of passing your driving test the DVLA will revoke your driving licence.
To regain your full licence you must:
Get your Provisional licence again.
Pass the theory and practical test again.
Points counting towards the total of 6 include any you received up to 3 years before your latest penalty point offence. Points imposed after the 2 year period will also count if the offence was committed during that period. Passing the retest does not remove penalty points from your licence, and if your total points reaches 12, you are still liable to be disqualified. (Just like everyone else!)