UKPN:
"The circuit is non compliant" It is compliant, with the 14th Ed. And regulations are not retrospective. What part of "not retrospective" don't you understand.
The new law requires that all rented property must be inspected against BS7671:2018 - the 18th edition. Whether or not it complied with the 14th edition is irrelevant. The only thing that matters is whether or not it considered safe for continued use, when measured against the standards of the 18th edition.
JPCoetzee:
Some of them have roughly-tacked together wooden back boxes and these should be metal (!).
No!
If you put in metal back boxes, you potentially have exposed conductive parts because of the screws unless the switches are of a type which conceal them.
The wooden back boxes may be as rough as a badger's ars*, but so long as they are reasonably sound, they are unlikely to present a danger. If some of them are roughly tacked together, are others beautifully joined, or what? ?
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