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I think they have some hydro electric too which is presumably very easy to switch on and off.

A decent aerial is about £50, plus cable, etc. I don't think you are being ripped off too badly.

Check you haven't a neutral earth short in the immersion isolator switch. Is the immersion feed clipped immediately against a lighting cable ? (Thinking maybe inductive coupling)

Didn't seem to quote a wattage so it's hard to judge. Also different numbers of bars shown. Towels will dry without additional heat eventually, so lower wattage = slower drying. Regular powered rails are typically 100 - 150 watts.

Welcome. You are dead right. It's a blatant lie! 1 Watt in gives 1 Watt out, and as you say a small amount will be lost by the transformer, so the actual towel rail will be less efficient, not more.

Floor socket box, (upside down of course)?

I would suggest making it clear to any client booking your services that they must be prepared to have their power supply interrupted whilst you work. I expect most would expect that anyway, but there are apparently exceptions!

Just invest in a grid linked solar system.

I don't know what a 4090 is, but assume you want 230 volt mains. I think you would still need to have a battery and invertor, like a UPS system and then a charge control system which recognises the two power sources, (solar or mains), gives solar priority and maintains the battery. I don't know...

If you use a laptop there are readily available cheap power supplies to run it off a 12 volt battery. You can also get a charge controller which would connect your solar panel to maintain the battery. This is all straightforward readily available gear as I use on my caravan. If you want to...

The moral to that is don't learn your electrical practices from a gas engineer. It really is bad practice which could potentially kill a person misunderstanding the cable useage in the future.

What's the purpose of NOT putting the garage on the ring? It's surely as easy to take two cables through the wall as one?

Agree you need to work out what you have. Trace the pipes. If two largish pipes go directly from the boiler to the HW cylinder then it's an old gravity system. Where is the pump ? On fully pumped systems it's often (though not always) integral to the boiler, but on gravity HW systems it will...

At least there wasn't a bull in there.

I can't at the moment as I've tied myself into a fixed price agreement which has exit penalties. Thanks for the offer though.

Personally I would be happy for my bills to be constant around the year, that is pay 1/12 of annual cost every month. In practice EDF insist on refunding my surplus and dropping the payments in autumn, only to raise the payments again in the middle of winter. It's as though they don't...

I, for one, consider myself extremely fortunate to have lived through seven relatively peaceful decades.

You only want co-ax if you are going for the "old style" CCTV system. I agree fitting connectors to that is easy. If you choose a network system you want ethernet cable, which I chose not to make up myself because it looked difficult.

I did this last year, and found that the first decision was between coax connected and POE network system. I chose network and bought a kit from CPC incorporating a four way NVR and two cameras. I bought another camera. Ready made cables were a bonus as these look fiddly to terminate. The system...

I don't believe it's the LED chips that are unreliable. The supporting electronics are under-rated and over stressed, just as the CFLs of a couple of decades ago were. Many have a bridge rectifier on the input which is vulnerable to voltage spikes, or a capacitor dropper which is also in line...