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Yes, but in a bathroom it must be RCD protected.

Yes, except: Well no, in that case. You should fix that. No reason for non-RCD circuits in 2025.

That’s unfortunate. There may be gaps around the joists that you could fill, but even then you are still conducting sound from the wall into the joists. Honestly you are unlikely to fix it.

That’s surely the lights. Is there another fuse inside the MEM switch box?

Does the intercom work?

It boils down to whether the discounts that you get from your friends are more or less generous than the discounts that your builder gets. Ask your friend for his honest advice.

Which way do the joists run? Don’t expect miracles.

I doubt it.

Let’s see if anyone else comments on that. I don’t believe it’s common to fit non-return valves in dishwasher or washing machine supplies. Yes; you can just chop a short bit out of the pipe and insert the tee.

(What do you mean by “check valve”? If you mean non-return valve, why do you think you need one?) Simplest option: https://www.screwfix.com/p/jg-speedfit-plastic-push-fit-adapting-appliance-tap-tee-15mm-x-15mm-x-3-4-/27471 Next simplest...

I got a quote for “EICR followed by new CU if satisfactory”, discussed in some detail with the electrician. The day came; he didn’t come himself but send a “lad”. The lad immediately popped out the cutout fuse and removed the old CU from the wall, with no testing. Moral of the story: they’ll...

LED bulbs do tend to start flickering when they are about to fail. It may seem unlikely that several are failing at the same time, but coincidences do happen. Did the "electrician" not suggest that it could simply be the bulbs failing?

What sort of bulbs are they? Have you tried replacing them?

Terminology note: "tails" are the things that join the valve to the radiator, and they are always metal. I'm not aware of any reason why you shouldn't use plastic pipe into the radiator valves.

The humidity inside the wall will be lower than in the bathroom - at least it should be! - so the danger of condensation onto the cold pipe is lower. Insulating the pipe would still be good practice.

No. Yes. Report it to Amazon as "dangerous, illegal to sell in the UK".

Single-and-earth wires are available. They aren't often used. My guess is that it is supplying a permanent live to something else that we don't know about. There are other possibilities. If you disconnect it, you may discover what no longer works. You haven't wired it exactly as before.

I’ve read most of your threads and I don’t think we know the “big picture”. Do you want to share? Yes it’s quite possible that you need planning permission.

Plugs and nails?! No. Plugs and long screws. Or possibly hammer-fixings, as above. Yes. What is the width of the alcove? Have you discovered the “sagulator”?

Hmm - do you have to constantly clean it? The ones I’ve seen in homes have been very grotty looking, but I guess that was in a hard water area, which I am not.