I went to the Land of Lost Content
in Craven Arms, Shropshire (UK) last weekend, and can report that in amongst the almighty collection of stuff
from the last 80 years or so there are a few (though only a few) vintage computer items. I noticed two Commodore Pets -- a 2001 with the chiclet keyboard and a 4032 -- as well as an Atari 800. There were also one or two electronic games (eg a Simon) and an original boxed Stylophone too.
Despite the lack of electronica, I'd still recommend a visit to anyone passing through Craven Arms. It's hard to show just what the place is like as you can't take photos inside, but a guy named "lazyhour" on Flickr has either got permission or been a bit naughty, and has a few photos here
. The ones that look like scenes from a semi-abandoned junkshop are the most representative!