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E14 is Small Edison Screw but E12 does exist but is rather rare. (Other sizes are E5, E10, E27 and E40 and the very obscure E11, E17, E26, E29, E39!)

Yes I have seen many of those. As you deduced they are a combined X class capacitor LN and two integrated smaller value Y class capacitors LE and NE. Can be hard to find nowadays - don't fret too much trying to get exactly the same values I reckon anything 0.1uF to 0.5uF (X) and 0.001uF to...

Do the RCBO trips happen to coincide with the oven thermostat clicking on or off? Had a case where sometimes the thermostat clicking OFF created a spark across its contacts that was vicious enough to create enough disturbance to fool the breaker into "imagining" a residual current fault.

Yes, I was thinking more of a future case if that 50W load were ever changed later then 4.7A would be most that cable length and size could support with a tolerable drop at the far end so probably no point fitting an MCB greater than 5A.

Going by max voltage drop of 5% (11V at 230 supply) then at the far end of 130m of 2.5mmsq then I reckon 4.7amps at most. So a 5 or 6 amp mcb would be appropriate?

Yes, my understanding is this arises from modern RCDs and RCBOs and AFDDs being chock full of electronics which in some designs get upset if the terminals they had disconnected remain still energised. To get A B or F (or arc) sensitivity requires electronics in the breaker. Older units with type...

Just wondering if that isn’t a 5 or 6 amp light switch misapplied?

Loads of them around. I have an HT208D which has an inrush peak capture that is handy. Remember on DC to zero every time orientation changes as the earth’s magnetic field is indistinguishable from dc !

Surely ASHP is not a micro-generation system - it is an energy consumer?

Datasheet describes it as 1P+N

To my mind the biggest problem is that all the lighting circuits are on the same RCD - should have split the lights across both RCDs

I can recommend Andrews & Arnold at £1.44 per month for VOIP. Not sure if they do redirect to mobile. I have a Grandstream HT-801 ATA (Analog Telephone Adapter) so I can continue using old pulse dialling gear and familiar answering machines etc.

I have a Rack-A-Tier and love it, it is pricey!

Are you a member of the RSGB ? They have an experienced team on the QRM helpdesk and solar inverters are a big issue - they have sometimes helped. If you aren’t in the UK perhaps your national amateur radio society has a similar resource?

The capacitors do not provide a safety function, on the contrary they only increase hazard. They are there purely for EMI/RFI interference reasons - which are important too. If the live and neutral from the inverters have no relationship to ground then any downstream RCD/RCBO/GFCI (USA speak)...

I know for a fact that the xpelair DX100T fan worls fine from a dimmer live. Even the lowest dimmer setting where filaments barely glowing (this installation had incandescent lights) was sufficient to trigget the fan and overrun time was same as when triggered by higher dimmer settings.

The two way lighting circuit you planned is acceptable but you should know there is another way of doing it that is often more recommended.

I'd go for option 4, two PIR sensors for earliest detection, two lights for redundancy (even LEDs have been known to die!).

Thermomix is German so the designers may be more used to their 220V end of the nominal 230V mains and set the alarm trigger maximum voltage to what they thought adequate but which is too low for the UK? The UK is around the 240V end of the nominal range and allowed to go 254V and that can...

15400 watts at 230V is 67amps. 43amps at 230V is 9890 W - so the manual ratings are a bit inconsistent?