From all the posts I've read (both on this thread and others) it seems that this guy is able to still trade because he knows the law. Quite literally, anyone can sell knifes provided they only supply to people aged 18+. Providing he doesn't try and trade under the same trade name as someone else he is acting within the law. So he finds a name which is similar to an already established and well respected maker, and trades under that name for a while 'til people get wise to him, then he simply changes the name under which he trades to another which is also similar. In law "similar" is not "same as" so he is covered.
If the blades are made in Pakistan for example but the handles are made in Britain, can the knifes be sold as "Made in Britain"? Remember, it's not that unusual for a blade to be made by one craftsman and the handle by another, and yet another for the sheath, so who made the knife? I think that is what he does, buys in the various parts and simply assembles them here, but maybe I'm wrong. If the knifes are made entirely in another country, but marketed as made in Britain then he is clearly breaking the law. Trading Standards would be interested if that were the case. Even if he is acting within the law BBCs "Watchdog" program might also be interested if it is deemed that this guy is damaging the reputation of other craftsmen or misleading his customers. But I think he knows the law and hides behind it.
I don't see it as a witch hunt, I see it as a group of people encouraging others to beware of buying an article that isn't what it seems at first, from a seller who deliberately tries to hoodwink his clients into thinking they are buying a top quality item. It is obvious that his products are not made to the same high quality as some of the well established makers (they say that imitation is the highest form of flattery, and his knifes are seemingly poor imitations). He's just very good at making people think they are buying the original when they are not.
Buyer beware.