Joy Ride,
Science Museum Large Objects Store on Wroughton Airfiled, south of Swindon. They do not hold open days now and the only way to access anything is to apply for a 'researcher access' visit.
The HP Gugnunc is there, that must be a prototype. The condition of the exhibits is deplorable - no fault of the local conservators and staff, who do their best, but completely starved of funds and essential maintenance. hangar roofs leak, concrete spalls off the inside of the concrete structures. Don't ask me about the Constellation ...
I like to think they don't do Open Days out of shame at their neglect, but actually I wonder if the Director and Trustees care that much. If they did, they'd have done something about it.
Nick