None, because I think the English system of registering Electricians id seriously flawed. I became a spakry back in Australia, where the standard of training esxceeds that of the UK. Further each electrician in LICENSED with the electricity and gas regulator. I was an 'A' grade electrician there. I sat additional training after my apprenticeship concluded to reach that. I further went on the become a Registered Electrical Contractor (R.E.C.), the only way an electrician can work for himself.
All I hear in the UK is cowboy this and cowboy that. You want to stamp them out then the Aussie approach is the only way.
The organisations you mention above are quite frankly a waste of time and money, Sure we have those in Australia too, but they are support bodied, offering assistance in running your business, not trying to be regulatory bodies.
Sorry if this winds up the UK locals, but its a fact. And for your information, there are no cowboy sparkies in Australia. They are all weeded out, any licenses they hold are revoked, and some even face prison time.