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It looks like there is din rail in the back of each box. Could have used some din terminals and links and made th whole thing look decent.

Almost. HV circuit breakers have an earth position, in which the outgoing circuit is connected to the earthing conductor. Obviously this can only be engaged when the CB is in the opened position.

Auto recloser's are a thing. They are usually found in HV distribution networks, and will automatically reclose a CB in the event of a fault. The number of reclose attempt is usually programmed and if the fault is still present the CB will remain in tripped state. So not off-on-off-on...

Stop and think about that for a moment. What does a switch do? What happens if you join live and neutral together?

Some building management systems may well use MODBUS, it's not exclusively for PLC and SCADA. Many industrial instruments and actuators use it also. I can't see it taking off in the domestic environment. Perhaps other thermostats/controllers/actuators from the same manufacturer also have modbus...

You could use 6 relays with the output contacts in parallel.

Yes. That's how it's wired now, that's how it needs to remain with the new switch.

The two browns in com to Lin. The single brown In 1way to Lout. The three blues in the terminal block to N.

I think it's quite clear from the photos that OP is using 3pin mains adaptors and not a shaver socket. Best advice is use two chargers and rotate the toothbrushes around. We have two if these and only 1 charger. They only need charging every 5 days or so.

Yes it does matter, if you don't connect both earth together then you are potentially breaking the earth continuity to whatever the second cable is feeding (boiler etc)

I have this one https://uk.rs-online.com/mobile/p/label-makers-label-printers/8406273/ Quite useful and has a mode for doing consumer with the correct spacings.

ABSOLUTELY NOT. The only upstream protection in that case would be your main fuse ~60-100A.

Brown to 1 (com), black (sleeved brown) to 3 (NO). But you need to check what voltage the existing is switching and if a neutral is present. If so then link the brown also to L and the grey sleeved blue to N. It is important to check the boiler wiring or risk damaging the boiler.

Brown and black is your call to heat. Likely brown is live, black is switched live. Or it could be a completely different switching voltage from the boiler. You will also need a power supply for the hive. You best to find the other end of that cable and see if the grey could be used for a...

https://www.mullanlighting.com/en/brown-pvc-flexible-cable-3-core

Been under water for some time?

You will require RCD protection for this new socket. Is this old heater supply RCD protected?

I have one of these. Think this is what you asking for. https://www.timeguard.com/products/time/immersion-and-general-purpose-timeswitches/wi-fi-controlled-fused-spur

What you need, is to be monitoring the flow that is being pumped. What is being pumped and what pipe size?

One of the largest water treatment plants serving London (about two thirds of all water) is fed from 3 SSE 22kV incomers. But all three of these are from the same SSE substation. A fire in their substation took out the treatment site for about 24 hiurs. There is now standby generators on the...