To go off topic a little why have so many properties become unsafe overnight with the introduction of the 17th edition. don't recall it happening before when new regs were introduced
If the plumber used plastic in the plumbing of a 16th edition property, then they 'potentially' remove the cross bonding (obviously different to each situation/property), which is now not required under 17th edition installations, thus making it unsafe.
I.E if you were doing a periodic report on the 16th site, with noticed breaks in the plumbing or where say, the E shower which had previously been secondary bonded to the copper which fed it, you would now mark the report as needing upgrading, which under the guidlines, if your not ticking satisfied then techinically it is unsafe, to some degree?
Remember in a bathroom under 16th, everything electrical needed the extra earth bonding, pull cord, shower, shaver, rad pipes.
So if you entered the property today, you report on 17th, the first agrument would be (based on the above) the fuseboard is not 17th edition, therefore you then notice that supp bonding is not present/does not meet requiments. Suitable remedy would be 17th edition board?
Im not the best at explanation but hope it makes sense...any thing that shows under a 1, 2, 3 or 4 on a periodic is technically unsafe to some degree...otherwise why are we reporting it?