Hi Ecoman, glad you like my Shing Raven, and if you are looking for a super strong UK legal slippy then Shing is your man.
The backspring and build on these is on another level, not built to my specs but one of a range that Shing does.
I'm sure he will build one to your liking, mine has a D2 blade and all stainless fittings and liners which makes it quite a heavy knife, but i don't mind that.
Not cheap and a bit of a wait, but a definitely a knife for life, so buy once, cry once.
Fully strippable for cleaning and maintenance as well, no connections etc. just a happy customer.
Link to Shings goodies
http://www.shingcrafts.com/