What if I hold a foreign driving licence?
You will still be prosecuted and the case will be referred to Court. The Court has the option to impose a fine and penalty points to a "shadow/ghost" licence which will be set up by the DVLA, or for serious offences, a ban can be imposed. In extreme cases, the Court can prevent you from driving until you have obtained a UK licence.
a na tej stronie:
http://uk.angloinfo.com/transport/driving-licences/driving-with-foreign-licence/ piszą:
After three years it must be exchanged for a GB licence. EU licences can only be renewed in the country in which the holder is resident. If a driver holds a licence from another EU country and renews it in Britain, it will be converted to a UK licence.
Penalty points given for driving offences made during the three-year period are recorded by the DVLA and listed against the driver's name. Drivers may be disqualified from driving if they accumulate 12 penalty points within three years.
Czyli wynika z tego że limit 12 punktów również dotyczy posiadaczy zagranicznych praw jazdy