I haven't read all the posts, but I feel okay offering my opinions anyway;
First off, I would like to inform our colleagues in the US that there is no blacksmith guild system here in the UK, and outside of, I think, London and Edinburgh, there never has been. The guild system, in its true manifestation, was little more than a racket, simple as that.
Secondly, pertaining to the NOS in the UK, if blacksmithing is your business, like any other business, you sink or swim. Unless you make the ridiculous proposition that all ironwork be made by "certified" blacksmiths, outside of specific heritage work, you will be competing with the cut-and-tack boys anyway. If you want to do anything, regulate who calls themselves fabricators first, and you would wipe out a vast swathe of competition in an instant. Of course, we would have to have the necessary qualifications ourselves which, ahem, not all of us do...
Third, having a few "safe use of machines" industrial certifications myself, I can tell you that, with very few exceptions (such as the oily-rag-on-the-oxy bottle thing), they are qualifications which for which you need either a) very basic common sense or b. the ability to remember the criteria needed for passing the test. So I don't think they should be held up as a defence against things going wrong and people getting hurt.