Legal Requirements
In the UK, it is a legal requirement for a driver to notify the Driver and Vehicle Licencing Agency (DVLA) of any medical condition that may affect their driving.
You can be fined up to £1,000 if you don’t tell DVLA about a medical condition that affects your driving. You may be prosecuted if you’re involved in an accident as a result.
To do this you can:-
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Visit www.gov.uk/health-conditions-and-driving or search for ''DVLA Medical''
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Write to DVLA at Drivers' Medical Enquiries
DVLA
Swansea
SA99 1TU -
Phone their medical department on 0300 790 6806
Notifying DVLA of a medical condition
Guidance on other common medical conditions
You must stop driving for at least 1 month.
You can restart only when your doctor tells you it is safe.
You do not need to tell DVLA if you had a stroke and have recovered.
You must tell DVLA if you have Parkinson’s disease.
You can report online or fill in form PK1 and send it to DVLA
You must tell DVLA if you have severe memory problems.
Fill in form CG1 and send it to DVLA
The chart below gives an idea of how a medical enquiry, following notification of dementia, is conducted by DVLA.
If DVLA need to contact the driver's doctor, this process can take many weeks or months.

If a driver licence expires in this period, the driver may still be legally covered to drive under Section 88 of the Road Traffic Act 1988 which normally applies as long as DVLA have received the correct forms and the driver's doctor hasn't instructed them not to drive.
To view more information you can click below.