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The fact the supply is in conduit with the conduit as the apparent protective conductor leads me to think they are coming from somewhere within that building and not a direct DNO supply.

I suspect there maybe a clause in your lease terms stating the freeholder can recover these costs through service charges.

The supply to that cutout is probably original and I suspect that is what they want to replace.

Can you show a picture of your electrical intake including the meter?

I think they mean by every circuit being parallel is that the R1 and R2 for any individual circuit is parallel within that circuit.

The 100ma would not be additional protection.

Can you show a pic of one of the RCDs so we can see the markings behind the switch toggle?

So he replaced the consumer unit but the installation had no effective earth? If you have paid you are entitled to the certification which would also include Part P notification. Were they a scheme member such as NAPIT or NICEIC?

Might be worth asking Master Spas. https://www.masterspas.co.uk/

Just been looking online and some say 32A/13A dedicated supply but not sure what that means. Is the size of cable written on the sheath of the cable?

No you can't use a 13A plug it has a maximum circuit capacity of 25A.

Does it say how many amps (A) or kilowatts (KW)?

You also need to understand the results and whether they are within correct parameters.

No worries.

In the first pic have you mixed the blacks up? The black in the 1 Way terminal should be the one which shares the same cable as the red presuming that is the switch cable.

Wiring your own house is one thing but undertaking what you suggest is a different ball game in terms of liability. Your opening post suggests you are not competent to be doing this. The installation should be fully tested as the retro fitting of RCBOs maybe problematic and some circuits may not...

Put the EV point in now even if it just terminates at a joint box.

This is being notified to Building Control?

There is no requirement to make it TT.

Are you notifying Building Control over this new circuit.