Got a warning of prosecution letter the other day. I am guilty of doing 38 in a 30.

It's my own stupid fault.
Anyway, as i'm aware i think i get three points and a sixty pound fine. Yes?
However i have had my license less than two years and am only allowed six points i believe. Is it the case that if i get six points my license is revoked or is it over six points. I.e. three sets of three points.
Hope my query makes sense???

Haven't been able to find links anywhere else as of yet...