I was sad to hear that Dave Prowse, aka Darth Vader or the Green Cross Man, has passed away at the age of 85. He was a regular guest at British Sci-Fi conventions. His session was one of the first celebrity guest talks that I attended at the first "official" convention I went to. He was a very interesting speaker and very approachable, and learning of his death has reminded me of the good times at conventions. Most people like to go on holiday to somewhere warm and sunny. David and I were not "most people". Our idea of a good time was a long weekend at a Star Trek convention - or a sci-fi con, at a pinch. When you factored in the costs of registration, travel, hotels and, of course, our costumes, it probably worked out the same as a week or two in Spain. In their heyday, the British Star Trek conventions were a weekend-long party. There were two "official" cons a year, run by independent committees, and the profits went to a charity design...