Very sad news. Obviously living in England i never met him but back in 1990 I wrote to him after reading about his fretwork in a book or magazine, (this was in the days before the internet and email) I never expected a reply but he sent me a very nice letter (which I still have, dated 11/9/90) and his catalogue of fretwork designs. I even still have the envelope he sent it in (marked Reidle products) I was so impressed because he sent it via airmail at his own expense which cost him quite a bit at the time.
I imagine he was a really decent bloke and this is a great loss to many people, must be tragic for his wife.