Both are long since defunct and neither seem to be particularly well chronicled despite their longevity.
That's why I've decided to run this fascinating three-page article (by editor David Nightingale) from the Anderson fanzine SUPERMARIONATION IS GO! issue 1 (Spring 1981).
I've published the cover in a previous post (here) but subsequently acquired a copy and found this article of particular historical note.
I think SPACE CITY shuttered sometime in the early eighties. I never went myself (but did make the pilgrimage to Longleat, home of the 'other' Doctor Who exhibition, for the legendary 20th anniversary event) but I kinda wish I had.