I have a sudden urge to watch really old QW demos, especially those from the UKCL/UKQFFL era. Does any one have or know where to find them?

I can't remember where these demos used to be hosted (if they were at all). But if I do manage to find some then I'll make sure they're well preserved for future!

http://www.daddied.com/demos/

there's at least some ukcl in the 'official' folder.

There are some demos available on the old clan pages for [DFC] and [CP]/[KOD]

Desert Fox Clan: https://www.desertfoxclan.com/results
Clan Pendragon: https://kod.org.uk/old/main.htm