Two things come to mind concerning CAA intervention;
1) Hospitalisation for more than 7 days requires notification to CAA.
2) Any documented loss of consciousness means instant removal of licence.
I was involved in this matter at a family /business level and I passed this information on to the enquirer. I know from personal experience, any head injury involving a pilot needed a minimum of eight years free of any form of epilepsy and had no initial documented loss of consciousness to even be considered fit to fly.