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The 2.5mm^2 flex will be adequately protected against fault currents by the 32A circuit breaker. Furthermore, the "8.6kW" oven won't actually be capable of drawing that much - that's just the total connected load with parts of it not able to be simultaneously energised. There's nothing wrong...

Normally key switched rather than unswitched. 

My point wasn't that they wouldn't need to look at your invoice for payment details. It was that they would have skipped over anything else just looking for the salient information, i.e. amount, payment terms, BIC and IBAN or Sort Code and Account Number. I'm not criticising what you have done...

In fairness an invoice was hardly the appropriate documentation to make such observations and recommendations. They probably only looked at it to determine what was owed and payment details. A letter along with it or an Electrical Danger Notification or something similar would have been much...

They're not paying again. The tax paid is offset against the tax owed. You have it wrong. 

That wouldn't be the way to do it though, would it? Nor does it particularly explain the need for a plugtop to short phase and cpc.

Surely you discovered the shorting plug by insulation testing before energising.

Be careful using terms such as "comply" and "doesn't comply". The 3%/5% figures quoted from BS7671 appear in an Informative Appendix and are not actually Regulations. The actual Regulation merely states that the voltage drop should not be excessive so as to ensure proper/safe functioning of...

I don't see what the definition of a circuit has to do with whether they make the business decision to charge a higher rate for a three-phase circuit than for a single phase circuit. If their policy is that a three-phase circuit will be charged as if it were three single phase circuits then that...

Same here - we've always required LD2 rather than the pitiful LD3 requirement of England/Wales. And, as stated, it's 3m of bedrooms - not 7.5m 7.5m would be to do with the sphere of influence of detectors in a room for determining when an additional one would be required, generally for Part 1...

For me the lack of a heat detector completely rules out using them. Here the minimum standards have for many years been LD2 systems, so the lack of a heat detector is a show stopper.

How exactly is disconnecting them from the Earth bar a good test for anything? And voltage is a potential difference so can only ever be between more than one point.

It's dangerous regardless. You put yourself in harm's way by doing it.

I think you need retraining about safe working practices. An incredibly dangerous and stupid thing to have done.

Because it's dangerous and grossly non-compliant with the Wiring Regulations as you have been repeatedly informed both here and elsewhere.

Just use a rotary isolator. But do you actually have a three-phase supply? And should you be DIYing this?

Is Cyprus on your way home?

Qual-PEX pipe is XLPE I'm pretty sure. It's used a lot here by plumbers often with bits of copper coming up through the floor.

As above - the obvious answer is a galvanised adaptable box.