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It's nothing to do with that anyway. The shift in spectrum is the tell-tale sign

what's the random switch back there?

If the photo shows the true colour of the LED (yellowy slightly green light output), then the phosphor has degraded. Pretty common at that age and will need replacement.

A photo of the connections at the oven terminals are likely to reveal the issue.

I don't understand this? Normally no one uses the main room lighting after installing task lighting and extractor lights :cautious:

Replace the capacitor. Mine did the same a few years ago

All modern RCBOs have some electronics too, I guess it's something no one has ever thought to mention before.

Saw this pop up yesterday, thought it was interesting. Actually not too badly priced from wholesalers, though the Hager website shows double the price.

The fans on modern boilers are quite powerful, at full load often over 100W.

The major cost is heat loss, likely to cost hundreds of pounds in the winter for the extracted air which must be reheated to maintain internal temperatures. Better to install an MHVR system if you want continuous ventilation

Double insulated isn't the same as insulated and sheathed cable ;) I doubt the supplier will do anything about it. You might have more luck with the DNO.

Normally Virgin use a different cable up to the isolator, triple screened and much larger in diameter. Just call Virgin out for a repair.

They're dumping 480 litres of heated water per shower, I don't think cost is an issue!

Firstly don't use "IP65", tape. The resin discolours over time, but also affects the colour temperature of the LEDs and reduces thermal dissipation. Secondly, use a good quality tape or you'll find the LEDs failing. I often run them at a lower voltage to increase the lifetime, since the headline...

Originally somewhere around 230 miles on average, now maybe 150 miles which gets me 2 days of travel.

There will be a fine thread in each wire to identify which conductor is which.

We already lost around 80 miles range in 3 years on our Model S, though it has mainly been supercharged every other day rather than the current limited charging methods. The batteries also seem to be reducing in efficiency also, with similar energy in resulting in fewer miles. Not great.

No. They're looking at the current waveform with certain characteristics, in particular there is a minimum peak-to-peak current for the arc event. The ignitor doesn't draw enough current to meet that requirement in the first place.

~20 kWh/day doesn't seem excessive at all.

It's not necessary to replace the consumer unit, but it certainly makes the most sense. It's unlikely to be feasible to do much more than replace all the MCBs for RCBOs, in which case you may as well replace for a consumer unit compliant with the latest version of BS7671 Current rating...