It wasn't just Beebs at Byte-Back, it was an event for all classic computers and gaming machines. There were two rooms at Bidds, but I didn't get any pictures of the main room as I didn't spend very much time in there because all the Beeb gear was in the second "Executive" room. It had to be the biggest Beeb gathering for many, many years. I would say our room was about 75% BBC and Acorn, although there were some other machines too.
This setup belongs to Retroclinic, and I am given to understand it is a Sega Model 1 PCB set, running Star Wars Arcade.