BobProperty said:
The problem is that we (society, law-makers) have only agreed a method for the demonstration of competence for the tradesperson.
Right, yes, sorry, stupid of me. However, I realise that I've been here before, in thought, and this is how it went:
There's a theme (amongst many themes) running through the laws of this country, which is to protect human rights from the misdemeanors or negligence of others.
With gas, there's an immediacy of effect following cause. Gas joints, once securely made, have no tendency to spontaneously leak. Also, it's a doddle to check, after any work, that no gas is escaping, and that combustion products don't go where they shouldn't. Therefore, a householder who works on his own boiler, or other gas appliance, is
quite unlikely to hurt anyone other than himself and his immediate family. Grey and woolly, I know, but go with me for a bit.
With electricity, an error can lead to a latent fault lying dormant long enough for a house to change ownership, thus inadequately tested electrical work can be a danger to those who had no vested interest in the original work. There is, of course, a threshold, below which a job is so trivial that there no latent fault can be introduced - changing a light bulb is an example of such a job.
I'm not privy to the debate that led to the introduction of the Part P regulations, but I suspect it's no coincidence that the Gas Regulations are as lax as they are, and the Part P Regulations as tight. Maybe gas will catch up - I don't know, and I don't claim to know - this is as close to chewing the cud as I'm likely to get.
I also suspect that this is why the morals and merits of seatbelt-wearing were once so hotly contested. For example, it makes sense, to me, to insist that all rear passengers must wear belts, in order to prevent them head-butting the front passengers to death in the event of a sudden deceleration. However, the front passengers can damage only themselves (in addition to damaging the public bank balance), which is why some of us (but not me) argue that they should be allowed to hurt/maim/kill themselves.
It strikes me that the law has to find the fine balance between infringing personal liberties, protecting the right to do whatever we like inside our own homes, and protecting the right of everyone else not to be poisoned, blown up or electrocuted as a result of our incompetence.