how do you propose we eliminate cowboys?
I'll suggest buying some bows and arrows, until I can come up with a much more sensible solution.
To be honest, a CLOSED book set of exams on the basics of heating and ventilating a house, wet plumbing, basic building regulations, water regulations and unvented cylinders and so on. A proviso that no examination can be taken within 4 weeks of attending a course. I find it all too easy to pass an exam when I've read the books that morning. I'd have much more difficulty if there was a time gap if I was new to the industry. If experienced then these basic exams would be quite simple.
Then subsets of exams on various forms of providing heat, i.e. gas, oil, solar, ground source, etc. A separate exam for basic electricity to be covered by plumbers and electricians and then more detailed exams for electricians.
Okay, I know it's more exams but IF THERE WAS ONE SINGLE BODY FOR PLUMBING, HEATING and ELECTRICITY instead of GasSafe, OFTEC, HETAS, MCS, REAL, CIPHE, ELECSA, NICIE, Mrs Jones's Trusted Plumbing and Heating Engineers, etc it would cut costs of registration and would also give customers a single contact point if they had an issue with a tradesman.
To me, all the above will stop those people just setting themselves up as a renewable heat source company and installing systems that don't work properly or are poorly installed. Please note there's nothing about recording phone calls, complaints procedures, etc, etc. It is purely trying to create a better standard of installation. I'm not trying to stop new companies - only wanting them to have sufficient knowledge and good installation techniques to make a good job as opposed to having great salespeople selling the wrong type of system to customers or not sticking to sensible installation standards.
As a separate topic I'd also like to see people like me who are reasonably new to the industry, having to pass a basic exam in building techniques (e.g. where to notch joists, sleeving pipes through walls, preparing walls before tiling, etc, etc). I'm sure most of us have taken an educated guess in the past when confronted with a difficulty and perhaps done jobs where we have since realised that we did something wrong.