This is very sad indeed.
I have been a HUGE fan of this man's work for most of my life. I have just about all of his shows on dvd. I love Space 1999, Thunderbirds, Captain Scarlet. To name just a few. I was practically wheened on scI-fi tv, which included Star Trek, Gerry Anderson's shows, and Irwin Allen's work. All amazing people who have all left an overwhelming mark in the sci-fi television world.