And they do to remove ambiguity. One of my agents insists on a single main switch for total dwelling isolation, including E7 heaters. It was reasonably easy to achieve in my situation but it did involve rearranging the 3m tails in trunkin [but effectively plastered into the wall] which went into sealed devices at one end, they were just about long enough with a bit of fiddling.If the agencies want a higher standard to what the law requires that is up to them, but compliance with 18th edition is misleading, as the 18th says it can comply with an earlier edition, so technically still complying with 18th Edition if installed in 2000 and it complies with BS7671:2001.
And the government document says the minor works or installation certificate must accompany the EICR to show work has been done, there is no government requirement for another EICR. As with an MOT the person writing any report must satisfy himself that no other faults have been introduced during any repair, so it would likely mean starting from scratch, so another fee charged, this is simply not required by the law, but agencies can ask for what they want.
Another agent [not one I employ] insists the gas & water etc bonding is done twice and any device sitting within unions [think heating pump, water meter etc] has a bond across the pipes
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