The Stroke Helpline get lots of queries from stroke survivors who want to return to driving, but aren't sure of the correct procedure they should follow.
You may find the following link useful in understanding the Standards for drivers who have had a stroke or transient ischaemic attack (TIA) - https://www.gov.uk/government/publications/inf1883-car-or-motorcycle-drivers-who-have-had-a-stroke-or-transient-ischaemic-attack-tia