Watched the full BBC interview via web this morning. The tremors aren't evident due to the quality of the feed. It was most apparent in television video.
Yes, I'll be keeping an eye out for that from now on. I wonder if the people getting books signed noticed anything? If he's right-handed, which I don't know, his left hand could rest on the table, and it might not show at this stage.
Guess it's clear I'm thinking Parkinson's.