"If you're banned from driving in one country, that doesn't stop you driving elsewhere in Europe. Attempting to return to that country driving a vehicle, though, will lead to your arrest. However, according to the AA, drink driving convictions abroad do not affect your U.K. licence. They claim that even if your licence is confiscated abroad, the foreign government will simply send it to the DVLA, which will then return it to you without penalty!
http://www.safetravel.co.uk/EuropeDrinkDriving Limits.html