You must surrender your licence to the DVLA or even the DVA If the doctor tells you to stop driving or If you don't fulfill the required requirements for driving as a result of your health care issue. If you don't surrender your licence, you must still advise the DVLA https://httpswwwandersoncarlconsu81246.losblogos.com/36554221/https-www-andersoncarlconsultancy-uk-driver-licence-an-overview