If everything is class 2 (specifically designed not to require an earth) then there is guidance that it can be considered safe for continued usage, with a stipulation that no Class 1 fittings (requiring an earth) are fitted to that circuit. I'm not sure the spirit of the guidance is to just replace everything with plastic to avoid the issue though.@SJD, thank you for this. I will try to get a photo of the CU (though I've agreed all access is arranged via the letting agency). There is only one light in the bathroom but defect was noted under both 8.6 and 8.7?
The light switches are metal faced (swapped a few years ago but can be reverted to plastic if need be).
I can mention those discrepancies you highlight to the letting agency and will try to get another quotation.
Out of curiosity, if all light switches were plastic and no light fittings were of a type requiring an earth, does the circuit still need a CPC?
Having said that, if the fittings were replaced a few years back, that begs the question by whom? The lack of cpc should have been identified at the time really - so does make me wonder if it could be a conduit system that wasn't recognised as such,
If it is original cabling, there may be other options, such as running a separate cpc from the CU to each fitting, but in practise cabling old enough to not have a CPC is likely to be >50 years old and may well need rewiring sooner rather than later.