Found this on the web and thought that other people might be interested ! Open Days at lots of places that are usually locked up tight all over the country with a county by county guide to find out whats near you. I'm booked up for the Warminster Small Arms School Weapons Collection and the Greenham common Base Decontamination centre already!
http://www.heritageopendays.org.uk/
http://www.heritageopendays.org.uk/