Isn't the point being made that regular/repeated testing to determine whether a fault was present is one of the forms of 'messing' which, ironically, could result in the introduction of a fault?
Yes, I'm sure that 'respecting the installation' would minimise the potential problems. However, as we know, there are electricians and 'electricians' and even a lot of the former (and, one assumes, most of the latter) probably have little, if any, experience of pyro, and hence may not even realise that it requires additional 'respect'! ... and, of course, as is so often being said/discussed here, some testing will often happen a fair bit more frequently than you suggest.
The decorator we've used for donkey's years must be one of those exceptions, then - but I do wish he could be made to understand the wisdom of isolating circuits before 'doing it properly'!!
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