Where was the Hitchhiker's Guide to the Galaxy franchise filmed?

The Hitchhiker's Guide to the Galaxy franchise has 2 titles (1981 to 2005), filmed at 1 place in 1 country. Wikipedia names 7 more. Every place links to its source.

The productions, in order

Every filming location they used

Each place appears once, even when several titles were filmed there.

Named in Wikipedia's own articles

Places named only in the titles’ Wikipedia articles.