Thanks for the responses. For anyone else who finds themselves in this position, you may not drive a motor vehicle for one calender month after a stroke. After that you should follow the advice of you doctor, they may wish to carry out checks before giving you the all-clear, depending on how bad the stroke was.
You are advised to notify your insurance provider. I was surprised at how laid back about it both car and bike insurers were. As far as they're concerned, Unless the doctor decides I'm unfit to drive, i've notified them an that's the end of the matter.