Normally tags don't have spaces, but that's no excuse - I'll take a look.

I can't reproduce. The tags on content screens, and the tags on the side_tag_cloud block, all quote the search terms - which retrieves the specific term only.
If I'm missing something please comment on it.

Well when I click United Kingdom on the meta tags side block, I am also getting results for United States so it must be matching on the United? No big deal, I'll use a catalogue field instead.

What's the URL it gets the search results at?

index.php?page=search&type=results&content="United+Kingdom"&days=-1&only_search_meta=1&all_defaults=0&search_videos=1

I also have keep_forced_open set to 1 if that's relevant, to get around the offline.html

Automated response: Looking up tags with spaces in fails if boolean search is enabled in the configuration / boolean search option poorly described

By default the the boolean search option is disabled. This actually allows boolean search to still operate, but based on automatic detection of syntax - and only via an efficient boolean search mode supported by the database software. This is not explained at all.

If the boolean search option is enabled, it must be explicitly stated. The tag search links are not doing this, do boolean search is not activated for tag searches like it should be.