To me its not about protecting the person that did this work originally its about protecting the poor innocent bastard that comes after him!...
This sort of work has been happening since time time immemorial and no matter how hard anyone tries to stamp it out they never will, its like weed for example no matter how much money the police throw at this problem they will never stop it...the only real thing you can do to stop this sort of thing is to educate people and hope they make the right choice. but in saying that there will always be some who do this sort of thing anyways...and secertly i look forward to seeing what sort of imagination others have and seeing stuff like this makes my training worth it beuause without us...people would literally be in the s**t.
but from a boards perspective its eaiser to go the tradesman because we are a known entity to them, but for them to trace history and then try to prosicute people based on highly circumstantial evidence just wont happen, they will just sit there merrily plugging away at the tradesmen to justify that large disciplinary fee of theres.
This is where a house WOF system is needed with yearly cpd poin...oops i mean a 3-5 yearly inspection or a at point of sale inspection so crap like this can be weeded out esp on the gas side of things.