historytrog - I spoke with him two weeks ago and he seemed fine then, but last week was not so good, and Ann said he couldn't come to the phone as he was too ill, which has never happened. She sounded concerned for him in a way I hadn't heard before, and it was obvious something was very wrong.
I suspect that it was just old age, but I'm guessing, obviously, at the moment. It's very, very sad, but then I'm very, very glad that I knew him for the time I did. We'll do something special for him, for sure.