I hold a JAR Class 2 and had a subdural haematoma in 2005 after a severe head injury. I shortly hope to apply for a Class 1 and my AME doesn't think I should have any issues.
However when applying for my Class 2 I had to get a neurosurgeons report that my risk of PTE ( post traumatic epilepsy ) was now in line with that of the general public. This was despite the fact I had never had a seizure.
My current Class 2 currently has no restrictions.
The key is getting a clear and authoritive specialist report from a highly respected consultant/surgeon. Expensive but it can make the difference.