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Thanks for your reply Sqad. He had a very bad accident around 1968, and subsequently underwent many spinal operations at Walton Hospital in Liverpool. He has total fusion of some "C" bones ? at top of his spine, and has some sort of wire from his brain? Spine? into a box in his lower abdomen. He's never been fit and well since that accident, and does have tremors. His father had Parkinson's, but Dad has never had a diagnosis of it. These episodes are frightening him, and distressing my Mum too. Once he stops the jerking motions and "comes round", he's quite lucid. What are these episodes called?