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The AC transformer outputs should go to diagonally-opposite terminals of the bridge rectifier. The other pair of terminals are the rectified DC outputs. Observe that one of the terminals is rotated compared to the other three; I think that one is the positive output (Edit: indeed it is marked as...

Have there been roadworks? This very much looks like gravel in the fresh water. You say the cold taps are clear, but have you checked any filters in e.g. electric showers or (some) mixer taps? If you fill the bath with cold water and wait, do you find any ‘sand” in the bottom? Do you have a...

Make sure that the cables are all only lights. You don’t want to accidentally bury the cooker supply in insulation. For soundproofing, acoustic insulation is of course better than regular “loft roll”.

Other parts of the building regulations apply to some aspects of electrical work - in particular, the “part M” regulations have things to say about how high the CU, light switches and sockets may be.

If it’s an outside tap, if you’re going to re-do everything then you should consider installing a non-return valve. This is a legal requirement to prevent water from e.g. a hose pipe from re-entering the fresh supply. (It’s possible that you do have a valve, but it’s incorporated into the...

Make a persistent web app. It will run anywhere, and you can now use almost any language of your choice, via WASM.

Because the ratio of electrical power in to visible light out falls into the range of values defined as band G. Considering the way that some houses are adorned with thousands of these lights, sometimes for months, I think it's worthwhile to rate them. "Why I light up my garden for more than...

No, you don’t. EFLI’s diagram does exactly what you want.

Stop saying “circuit”, it doesn’t mean what you think it means and it is confusing some of the other replies.

Get it tested - but it looks like plasterboard to me.

OK, so is it reaching 21 degrees? Is the aim to make it warmer, or to reduce bills? Or to resolve the condensation? You need to be clear about what your objective is. Standard question: how do they dry washing? Are there extractors in the bathroom and kitchen, and do they use them?

“Fairly cold” in the loft despite zero heat input sounds like a good result to me - I’d expect it to be “absolutely baltic”. Well actually having some heating, and turning it on, would be a start. Do they have the heating on? What is the thermostat set to?

Dear Experts, What’s the difference between: https://www.screwfix.com/p/no-nonsense-405-standard-jointing-filling-finishing-compound-5kg/442rl “Gypsum based. Designed for jointing plasterboards when drylining and for levelling wall irregularities. Easy to sand in preparation for decorating...

4 x 90-degree metal brackets, fixed to the uprights. New piece of worktop cut to size, supported by them. (I’m not sure that painting that worktop will work well. What sort of paint are you considering?)

Go to your favourite electrical supplies website and search it for “maintenance free”. The same as the cable you’re extending, probably.

Yes they contain water. I suspect that they have some sort of baffle that prevents the hot water from reaching all of the columns. If this were connected to central heating, you would want to prevent the hot water from entering at one bottom corner and leaving at the other bottom corner without...

Rockwool is easier to make fit snuggly into gaps.

That’s called overconfidence.

OK, in that case the double-pole switch is believable.

Listen to the expert.