Think this should just about sum it up:
Endorsements must remain on a licence for 11 years from date of conviction if the offence is :
drinking/drugs and driving (shown on the licence as DR10, DR20, DR30 and DR80).
causing death by careless driving whilst under the influence of drink/drugs (shown on the licence as CD40,CD50 and CD60).
causing death by careless driving, then failing to provide a specimen for analysis (shown on the licence as CD70).
or 4 years from date of conviction if the offence is as listed below :
reckless/dangerous driving (shown on the licence as DD40,DD60 and DD80),
offences resulting in disqualification.
disqualified from holding a full licence until a driving test has been passed.
or 4 years from the date of offence in all other cases.
Check this for more info:
http://www.dvla.gov.uk/drivers/endorsem.htmhttp://www.dvla.gov.uk/drivers/endorsem.htm