Thanks for the recommendations so far.
I wasn't aware of Northumbrian Tin Soldier - some of those do look pretty Froudian, a good shout for this project (I say 'project'... at the moment it's 'a pretty vague concept').
Likewise the Acropolis Miniatures ones. I can see myself trying to get hold of some of them.
The Arcworlde minis are very nice and have a nice aesthetic. I was looking at them the other day, actually, but don't remember seeing these. If I ever expand the project (to 'things that weren't in Labyrinth but could have been') they're worth thinking about.
The old Citadel Gnolls etc are certainly always a possibility (I have a few of them, including the 'Great Gnoll w. Pole Arm', who has been a member of my Goblin army for about 40 years now).
Those RAFM ones also look good, just what is necessary (and 9 quid for 5 is certainly more to my liking than £30 for 5).
Any other suggestions gratefully received!