Thank you for your response. Paramedics, ambulance and police attended the scene immediately and I was taken straight to Hospital. I have already had a CT scan which I am assuming would be to rule out a stroke or brain tumour (I was very confused initally and could not walk unaided for a few hours afterwards) - am I right in thinking that these would be picked up on a CT scan? The Hospital that I attended have now referred me to another Hospital to see a specialist - I am currently still waiting for an appointment. I have been advised that I will not be able to drive (which is no great loss) but I have also been told not to cycle at the moment which is a great loss.
Regards
Yes, it is possible something happened recently or during your bike ride that caused the seizure. You need to find out what is going on. It could recur and mean you have developed epilepsy, or it might be caused by a stroke or a brain tumor. Fortunately it might be something much less scary, but you need to find out what.