There was a thread about this a while ago on another forum, I'll see if I can find the link in a mo. iirc, the conclusion was that it's one of those grey area knives, just to be helpful. I'll edit link in when I find it, 2 secs.
http://www.britishblades.com/forums/showthread.php?t=47032 There ya go, not much useful mind. There was another thread that mentioned it btw, but the person discussing it seemed to think it couldn't be opened with one hand, so not sure how much I'd trust him