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Screwfix is a joke shop - not a wholesaler. Never buy conduit there. It won't even be the correct length (3.75m).

Why?

Of course, but that is impossible to prove unless the DNO assure that it is. (They won't.) It's also becoming exceedingly unlikely to be true.

No. It would more accurately be stated that it is presented as TN-S at the property, but may not in fact be TN-S.

Again, there is also PNB. TN-C-S is not always PME.

There is also PNB (Protective Neutral Bonding).

As I alluded to in Post #2. It's certainly not ideal, but depending on the internals of the DB may well be doable.

There would need to be a double pole switching dedicated RCD. To this end an RCBO which also breaks the neutral (which BG do indeed manufacture) would need to be fitted adjacent to the circuit breaker for the surge arrester and main switch (assuming that there are spare unprotected neutral...

Indeed. So my stance on it was really very obvious.

Unless you are incredibly hard of thinking it would be abundantly clear that I was suggesting that I would not, in fact, be satisfied with lack of receipt of the document. It's very basic comprehension of your English language.

"I never made such a claim" was a pretty clear answer.

Required by scheme operators, and required by the Wiring Regulations are not the same thing as required by law, which was my point. As for whether I would be happy not receiving such documentation, I never made such a claim. I merely challenged the erroneous claim of illegality.

There is nothing wrong with properly maintained TN-S. It could be argued that it is the superior Earthing system in many ways, although costlier for the DNO/DSO to implement/maintain.

A good few years back - or many years back - would presumably be much more accurate...

An Electrical Installation Certificate is certainly a requirement of the Wiring Regulations, but I am doubtful that there is any law which obligates the issuance of such documentation. Ther Certificate of Compliance (if that is indeed what the document issued relating to the Building Regulations...

PVC/PVC single blue is fine. The T&E already has the cpc - no need for blue and Earth.

No, it won't. But it is highly effective.

Throw them in the bin. They do not meet safety standards.

15kWh

Jumping out of aircraft (e.g. aeroplanes, helicopters or hot air balloons) is incredibly safe. Use a parachute if you want to jump again.