I saw Diz a few times back in the 70s, and was lucky enough to play with him once. I ran a very poorly attended blues club in Mortlake in the late 90s, and invited Cliff Aungier (my original teenage guitar hero) to headline one week. He invited Diz as his special guest (along with Andy Cortez, then still a child prodigy).
Cliff was rather the worse for drink, unfortunately (as per normal at that time) and Diz took charge of the evening: backing him up, telling jokes, etc., pulling the whole evening into shape. Because I happened to know a few Django tunes, he invited me to join him for a couple. (Unfortunately I couldn't remember them as well as I thought I could...:-(.)
A really lovely guy.