Looks like you're into: legal carry knives for the UK and dangerous looking fighting type knives.
You've got a UKPK which is great but you might consider something a bit more socially acceptable (I can almost guarantee you will get it confiscated, at the least, should a policeman catch you with it unless you can make a good excuse for it. It may be legal under the knife laws, but he can threaten to charge you under the offensive weapons act and a £55 knife
(they are £69 now) is probably cheaper than the legal fees of making him do it so...). A Case folder, a good SAK or any of the more expensive ones (like the MWH Legacy) would do you well.
As for nasty evil pointy things, I think you need (this will probably be a long term wishlist but that's the fun ):
A karambit (Emerson Karambit or...well not many quality companies make them so probably from a small American maker)
An Emerson should be here for Xmas
A dagger (Fallkniven Fighter, Applegate Fairbairn, Fairbairn Sykes)
Still looking for an original
A bearclaw style knife and/or hide-away knife (CRKT bearclaw, the Hide-Away Knife)
I'm going to get both of these
A tanto, either a folder (Emerson CQC-7 or Benchmade Stryker etc or a Cold Steel fixed blade tanto perhaps)
don't like tantos
An assisted opener (one of the Kershaws or Camilluses)
not found one I like yetA nasty looking fixed blade (Ka-Bar, one of the big SOGs)
My knuck knife isn't nasty enpugh for you?
A bowie (so many people make them well, pick whatever really)
Something silly and over the top like a Gil Hibben
I want the rambo collection
A Spyderco Civillian (the ultimate "this should be illegal and probably is" knife )
I do want one of these as well
Also, you should get:
A good and proper locking folder (anything by Benchmade or Spyderco really)
I like the spyker
A bushcrafter (plenty of British makers out there, you can even get a kit and build it yourself)
My wife's been eyeballin' the kits for me as a stocking filler for next month
Thanks for the tips, would quite like a CS black bear as well.