That Silk (2nd last pic) - it's just possible that I've ridden it! It wasn't 1984 and I know it wasn't the only grey one ever built but they were never what you'd call common. I was hanging out at the Highlander when it was still a pub and got talking to a guy that owned a 700 Silk. We compared our uncommon bikes (I had - and still have - a 350 Morini Sport) and out of nowhere he asks if I wanted to have a ride on the Silk. Of course I did...! Real strange mixture of 1930s & 1970s but good fun.