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The reference you mention is included in the Electrician's Guide To The Building Regulations (pg 65)

User Manual

I think you're just postponing the inevitable .....

https://www.saynoto0870.com/ handy site for finding free and geographic rate numbers for companies.

No RCD required then

Is an RCD in the circuits causing these high Zs?

Thanks for all suggestions. I managed to find this with 10m flex - exactly what i was looking for! https://www.essentialsupplies.co.uk/cgi-bin/sh000071.cgi?WD=pendant&PN=Pendant-Lampholder-ELPENDANT_10_ES.html#SID=243

A picture paints a thousand words - but probably not in this case...

Sorry I probably didnt explain well enough. The lantern is perforated and provides no protection against the elements so any pendant enclosed within will itself be exposed to the weather and therefore I was looking for something like the pendants used in festoon lighting which are IP44. I hope...

Customer wants to hang an illuminated Moroccan style lantern outside. Like this http://www.moroccandecor.co.uk/Moroccan-Lantern-ML23-1 I was thinking about using a wiska box to connect to an IP44 pendant with its own flex  -  something similar to whats used with festoon lighting but cant find...

Any good http://horstmann.securemeters.com/files/8814/6916/4125/user_guide_H37XL-USeries21.pdf

So the lights are not protected by RCD. Your existing switch cables were installed under a previous edition of the wiring regulations. The current regulations require buried cables to be RCD protected.

I can't see completely clearly but certainly looks to me like your lights are not RCD protected - so no as buried cables require RCD protection.

Is the circuit RCD protected?

Does anyone have either a  Contactum 92503 25A TYPE B RCBO or a  Contactum 93203 32A TYPE B RCBO that they would be prepared to sell to me?

I've seen T&E carved up like this too with the unwanted cores cut out - often when its a borrowed neutral with one cable coming from one circuit and the second from another circuit.

I fit these http://www.timeguard.com/products/light/ledx-lighting/30w-led-energy-saver-wide-beam-pir-floodlight-black reasonable price, 3 year warranty, IP55 and have proven reliable on numerous occasions in coastal locations.

Domestic Installers will have varying qualifications including level 3 I&T etc. gained over years of college attendance. Yes some will have short course qualifications but far from all. The choice between DI and  AC very often comes down to the extra admin burden that AC involves which is...

To suggest that Domestic Installers and 'the short course brigade' are one and the same is ignorant and misleading.

I take measurements before the ceiling is boarded out. Once it has been boarded I cut holes before plasterer has skimmed. Mistakes do happen - these can easily be fixed before skimming - not so easy afterwards. The plasterer is just trying to make things easier for himself - which isn't...