I assume there are no actual blatant C1's or C2's deeming it Unsatisfactory?
just a massive list of C3's and/or FI's
Otherwise its an easy summary?!
(e.g. This installation lacks several significant essential safety features required to comply with BS7671 for continued used. These need attending to ASAP to avoid further risk of injury to any users of the installation.)
So here's my tuppence in the pot for a...
"Satisfactory.. But really does need an update!" .
"Whilst the installation inspected is functional, there are obvious signs of poor standard workmanship, (probable DIY). Significant parts of the wiring, accessories, and protective devices, are very old and possibly well past their manufactures expected lifespan. Many older installations were designed to accommodate a very different electrical demand compared to the expected typical usage of a modern installation. It is not wise to keep any electrical installation operational, up to the point that it finally fails, requiring replacement/upgrade, resulting with loss of power and significant inconvenience, due to the inability to re-instate power to any critical circuits.
Although the condition of electrical wiring can be difficult for many to comprehend, especially if lights & sockets are still working, by following industry standard guidance for inspection and test, with approved meters, the current level of deterioration is clearly significant. If this were a set of car tyres, I would consider this installation to be within the 1.6mm to 2.0mm depth range. (i.e. Tyres over 1.6mm tread depth may be legally valid for use on UK roads, but once around 2.0mm plans for prompt replacement are normal practice). Without prompt remedial action this installation could deteriorate at a continually faster rate with an ever increasing risk of danger of electric shock or fire."
Because electricity is invisible and can kill a healthy adult in less than a second, I would suggest a reasonable level of urgency is applied to the areas requiring attention that I have highlighted.
Guinness