Daisy,
going back to your question, my opinion is that the GCF test is a positive thing for you to do, even it is just for your own satisfaction in passing. When you pass you should be able to get some free PR and a photo in your local press, and people will look at the certificate in your shop and see that you have taken and passed a qualification for what you do (even if they have no idea who the Fine Art Trade Guild are). But why stop there, be one of the few framers in the UK to take the CPF exam too and get even more PR from that.
I have not taken either test and to be honest I doubt I ever will, but I am keen for people who work for me to work towards taking the test.
I do like JGF1's idea of a separate part of the Guild being for picture framers, and an updated logo etc, but I can't see it happening, especially now the PPFA are increasing their activities in the UK. I can only see more people joining them (even if its for no other reason than the name has 'picture' and 'framers' in it)
I have considered whether joining the Guild of Master Craftsmen is more relevant to my business, the image of this Guild is well known and respected amongst the public, joining is a much more selective process, requiring a substantial portfolio , workshop inspections, interview, and clients you work for are contacted to answer a questionnaire.
The vast majority of framers that are members and non members of the FATG undoubtedly have a great love and passion for what they do, it is after all a fantastic and enjoyable business to be in and I do think it is a real sad state of affairs that so many people are unhappy with the guild and their representation of normal framers.
I just hope people are taking notice of these strong views and working towards changing for the benefit of all framers!