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I think there must be some bit of YouTube algorithm or similar social distraction that is amplifying a story about cavity insulation being useless. The reality is that it has been used for ~50 years or so with most properties being absolutely fine. I’ve lived in several such houses. Sure there...

Thank you for finally explaining that. Edit: one further clarification needed: when the rad was fitted on the wall and the mould was appearing, was the radiator actually turned on?

The “untreated wall” numbers that that table look wrong. I’d expect something around 0.5 - 0.6. The benefit of their product looks less impressive in that case…. I find these numbers are easiest to think about if you convert them to Watts and then to £. “X times better” is less meaningful than...

Wickes will deliver almost anything for only £4. There is a good chance of it being warped though.

Let us know what happens. (Anyone want to bet on the outcome?)

It's a cavity wall, so cavity insulation is the obvious choice....

There isn't a radiator. He has removed it. I think he's talking about a patch of wall where a radiator used to be, though it's not very clear. See posts 10 and 11.

Have you considered insulating it?

So the radiator is a red herring then; it’s just a patch of cold wall. What is the construction of the wall?

Is this radiator a actually on?

Reduce humidity. How do you dry washing? Extractor fans in kitchen and bathroom.

https://www.plumbingsuperstore.co.uk/product/climaflex-pipe-insulation-1m-lengths-same-as-tubolit-pipe-diameter-x-wall-thickness-x-length-15mm-x-9mm-x-1m-climaflexinsu028.html Plumbing Superstore seem to sell 22mm insulation in thicknesses of 9, 13 and 19mm.

I think you should ask them: https://unispectra.com/pages/contact I can imagine that in principle you might be able to adjust the frequency response in some way by adjusting the lengths - maybe the aim is to impove discrimination from e.g. mobile or something. I've not found anything by...

Does that seem too high or too low to you? 20p per kWh seems rather cheap. I think that a 600W electric towel rail will not not be running constantly, unless it is very large, i.e. there will be a thermostat of some kind. So the average power will be a fair bit less than 600W.

You could do that, but I’d probably leave the original socket in place. You can’t have too many sockets.

OK, so we don't need to worry about it, but... ...I really can't see a plastic earth pin in that photo.

Take more care of your tools. Don't swing them around by the cable etc. At the first sign of that happening, dismantle, chop the end off the cable, and re-assemble.

Is it just me, or is that plug missing its earth pin?

Cables should not fray. Post a photo. How are you abusing them?

Thermostat.