Well I am supposing, no ifs or buts that would be totally illegal in the UK.
Erm, no. Let's not do the tedious legal arguments, because there is no argument. It is legal to own this knife in the UK, and it would be a pleasure to do so.
The best way to look at this is; it's not a bushcraft tool, or a weapon, it has no intended use other than the imagination, it's a piece of skill and art that is here to be admired and appreciated as such.