EU licence holders who live in the UK have a legal obligation to notify DVLA of certain existing and worsening medical conditions. Failure to do so is a road traffic offence, carrying a penalty of £1,000. This information is available through a number of channels, including guidance leaflets.
Holders of EC/EEA licences are required to register with the DVLA vocational (LGV/PCV) entitlement to drive, within 12 months of becoming resident here. The registration process aims to ensure that these drivers meet the UK health and conduct standards.
New residents from non-EC/EEA countries may not drive vehicles over 3.5 tonnes until they have passed the relevant British driving test.
Enforcement of road traffic law is a matter for individual chief officers of police.