The images say all that is necessary really. It looks like an interesting event organised by interesting people collecting interesting things. This info was given to me by a Brit bike rider who came along to BOBBD organised by the BMRCO. I have met some of these guys before and they collect anything and I mean anything. If you make the right noises you may actually get in free.
BOBBD – Best of British Bike Day, organised by the British Motorcycle Riders Club (Oxford)