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None whatsoever. It's a switch. Nothing more. They are all 100A maximum because 100A is the maximum supply you will get for a normal domestic property.

Probably someone who was convinced that socket outlets cannot be fitted to anything other than a Ring Main so they wasted their time contriving a dangerous mess instead.

If someone was to climb up there and plug in a welding set then the 6A MCB would trip. Then they would hopefully realise that it was not an appropriate location to connect high powered equipment.

A plastic box is a plastic box. It has no electrical components and therefore cannot have any current rating.

Leftovers from decades ago when 30A fuses were common and people thought it was appropriate to conceal round brown junction boxes everywhere.

Get rid of the plaster and start again.

The phone is broken. Buy a new one. Unrelated. No.

You do not need an FCU. If you want a socket there, connect a socket to the cable.

That is a 1p discount available where you lease a car from OctopusEV and also buy your electricity from Octopus Energy and have also signed up to their Intelligent Octopus Go tariff. Who installed the charge equipment and what type it is has nothing to do with it.

Ceiling tiles are designed to control sound levels with the room, as used in offices and the like. They are of no use to stop sound entering the room from somewhere else.

That's because they don't exist. Who installs equipment is unrelated to where electricity is purchased from and how much is paid. People can change electricity supplier at any time and pick from a wide variety of tariffs. Meter boxes are for supply and metering equipment only. It has never...

All that is true, but it's still just a switch with two wires. Buy new switch, connect those two wires to the switch. The end. Other taped wires are unrelated.

Charge current is set as a maximum by the connector box and the cable used to connect it to the vehicle if that cable is a separate item. The vehicle will charge at whatever current it chooses up to that maximum. What rating of socket it's plugged into changes nothing.

In terms of those diagrams, nothing. However modern RCDs contain electronics which are powered from the supply. it may be a requirement of the manufacturers spec that those electronics are disconnected when the device trips - which would not happen if a supply was connected to the 'load'...

Two things: Using the single and twin cable in that way between upstairs/downstairs is a poor choice as it will create significant EMI. Switch cables should be 3C&E so that a neutral is available at the switch position.

The ESI thermostats use 5V DC, the Tado requires 230V AC. There is no compatibility between them. If you want to use the Tado then the ESI control PCB will need to be removed, a suitable wiring centre installed in it's place, the plugs on those zone valves cut off and the wiring for them and...

There isn't any other way - the SPD is connected to the supply, which supplies the whole building. Even if it was installed in a separate consumer unit, that would be connected to the same supply as any others. SPDs can be installed with an isolator for the whole installation. They can...

Mid 1980s. MCBs are Type B which only existed in BS3871 from 1981 onwards. Main RCD BS4293 which is most likely the 1983 edition of that standard, and that was replaced by 61008 in 1990.

The difference between that and the 2 core version is less than £50. If you really must save that £50 then get 3 core 6mm² instead. 6mm² is good for at least a 10kW load. You will not be needing anywhere near that - and if you did, an entire new supply would be required at a cost of £1000s.