The situation with electrical is exactly what I mean I don’t want to see for all trades. I am trained and qualified for electrical work but don’t work in the sector. To provide the appropriate sign off I would have to pay significant sums to NICEIC.There in lies the biggest problem, I would suggest most "homeowners" are oblivious to the requirements of Part P etc, and whilst they can happily go into one of the sheds and buy anything they wish, and carry out work with no comprehension of the regs, nothing is going to stop them.
For sure this doesn’t stop the numpties from just doing it but those who actually do know what their doing and are aware of the legal aspects it then becomes a significant blocker.
I would hate to see the same for the other trades which the original suggestion of regulation would likely lead to.