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It's a rebadged effort with a label that is no longer used. Was made by Lewden, but their products have changed since then. Given it's: 20+ years old was a cheapo econosave thing no parts available other than dodgy used tat from the usual suspects no RCDs for most of the circuits the RCD it has...

Yes, they can be installed in a bathroom. 600mm from bath and shower. Other items are unrelated. Diagrams that show otherwise are wrong and always have been.

Don't go there. To do that properly would need a minimum of 5 years experience working as an electrician full time. Preferably more. It's an area where getting some piece of paper from a course means almost nothing. Most of testing and inspection is the inspection part, and you can't learn...

Maths is really not used there. 99% of it is just the set of standard circuits as found in the On Site Guide, chapter 7.

Really depends on how much and exactly what you want to know - 'electrics' is a vast area of things. Maths is certainly involved, but for many things won't be used often or even at all. Scaddans books are ok, but they are written in an older style and assume a certain amount of prior knowledge...

Yes, as in the other post before this one. There are also surface items which do not require any installation: https://tiger-supplies.co.uk/external-vehicle-cable-protector-3-channel-900mm-l-x-500mm-d-x-70mm-h/ Still looks like you are massively overthinking this - a cable laying on a driveway...

While that is all valid, you would be far better to dispose of the 3 port valve and use 2x 2 port valves instead. No relays required, no valves being held open for ever.

All modern consumer units are fully enclosed at the back, there is no need for any board behind one. Generally they are fixed directly to the wall. There were some rewireable fuseboxes which were just a frame and front cover, and those did require a suitable board behind or the use of a...

The vast majority of privately owned homes do not have EICRs. Those that do (such as some rental properties) will have an EICR that covers the fixed installation. Plug in items are not included and there is no way to know what people may choose to plug in. If people choose to plug in...

If it's underground, it's out of sight and will be permanently immersed in water. No one will be inspecting it until something goes wrong. The two proper options are above. If you want to do something else, then good luck with that.

3 core & earth, so you have both switched and permanent line at the mirror position.

No, as it's not suitable for concealing underground. That won't be happening, as the wires are permanently crimped into the plug contacts. You cannot attach electrical equipment to a trellis. There are two options. Either put the EVSE on the garage wall and extend the cable to the car when...

You can't attach an EVSE / wallbox to a flimsy trellis, they need to be wall mounted or fixed to a pedestal. If you must have it at the right side away from the building then a suitable cable will have to be installed underground from the building to that location. This will add a substantial...

This whole 'bidirectional' effort is meaningless for the vast majority of circuits. It's mostly hype shovelled up by the issue of Amd3 to BS7671:2018, which was touted as an 'emergency' amendment to add such things. The main driver was the usual bandwagon companies slinging in PV and battery...

It was 15+ years ago, where it was typical for 'dual RCD' efforts to be considered proper and valid by some manufacturers and those people that were sucked in to the dubious marketing efforts of the time.

Rip the whole lot out and fit items which are appropriate to the space. Worst 'refurb' ever.

Use the isolator handle directly below. Release any pressure in the system Undo the other end, only a small amount of water will be lost. No need to 'drain down' anything.

Loose connections.

Either could be done. You could connect to the lighting circuit and use a double pole switch to isolate.

If under the path it will need to be deep enough so that the cable is below the concrete slab, and therefore not affected by any movement or cracking of the concrete. Cutting into concrete across a narrow strip like that between a building and a fence will be a pile of bother. Clipped to a...