I saw him give a lecture a couple of weeks ago at the Engi faculty at my work!
http://www.theage.com.au/news/music/father-of-dr-who-dies/2008/04/28/1209234732996.html
http://www.theage.com.au/news/music/father-of-dr-who-dies/2008/04/28/1209234732996.html