The UK Pen Knife was designed to satisfy the strict legal guidelines of the UK that govern the size and function of all pocket knives carried in public. Spyderco's UK Pen Knife is a SLIPIT non-locking folder that is accepted virtually everywhere for slip-in-your-pocket urban carry (check your laws to be sure). It is lightweight, functional, and quality-made.
Spyderco Knives are extremely popular in the knife community and come in many shapes and sizes. Check out what is available at Blade HQ today!
This is the knife I go to when I want something lightweight and easy to carry. The wire clip is awseome and carries very deep. You can't go wrong with this knife.
I'm German and have to dodge some really weird knife laws, if you want to be on the safe side get something non-locking, for the UK it's actually mandatory to have a slipjoint. It's actually the strongest out of my slipjoints but never the less one of the easiest to deploy, their special spring is really awesome. It's an absolutely perfect user but I have to say the Lightness is something to get used to. It's made in the US and what little hardware is on it is very well done. I'd not only recommend it for legal reasons, there is probably no knife that combines such a blade with this little weight, so I often take it to go running because it doesn't bounce around in the pocket. If you want to take a piece of America with you on your next euro-trip you can't go wrong with this bad boy to cut your Bratwurst or Parmesan (but inform yourself ahead of time, some countries do get even stricter!)
I really like this knife. If I am going somewhere that does not allow locking knives, this is knife I carry. It is very secure in that the finger choil prevents the knife from closing. It is a good slicer and is small in the pocket. I liked it so much that I also bought the S110V version with blue scales.