I was looking through my old photo's and came across this picture of the Cloudships of Mars game from the 2006 Salute show at Excel. It was a participation game run by the South London Warlords and really made good use of the space available to them in their 'new' venue in docklands. This was actually the games third outing, having previously been been at Salute 05 and at Selwg 05.
Its worth taking a look at the South London Warlords pages for this game because there is loads of info available on the rules, the setting and the inspiration. This was one of those participation games that I look back at now and kick myself for not having taken part.