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Yes.

Yes, but does it not have a switch?

Yes. Yes, you will have to keep it. It is not really necessary but there is a silly rule by the DNO.

Yes you do. New means new - not there before. There is nothing saying you cannot have a 'new' (there you go; I knew you knew) connection for a hob without replacing a consumer unit.

Your assumption is correct. It is a repair which is not notifiable. 4mm² would likely have been adequate if the route does not involve running through thermal insulation. That will be fine. It is not notifiable. Part P merely states that you shall ensure it is safe. This is Part P of the...

https://www.legislation.gov.uk/uksi/2010/2214/regulation/12 That is the actual law (in England) and that is all it says. So, what do you think? It is not (b) or (c) so is it a new circuit? You may decide just as well as anyone else.

I would say you are correct. You don't actually need the second breaker in the garage at all.

Put an MCB in instead of the RCBO to rule out earth leakage - or not- maybe there is a short when something happens.

Looks alright. No. Many an hour wasted on faulty new products.

(y)

Yes. When you say cooker, do you mean oven? If so it would be better (though not critical) the other way round - 6mm² to hob and 4mm² to oven.

6.6kW @ 240V is 27.5Amps

Is it a rewireable fuse? Are you sure it is 4mm². That would be most unusual.

You could have a usb socket but not on a normal electrical socket (in a usual sized UK bathroom). You seem to have bought something unsuitable for your needs.

It won't draw that much when all the elements are cycling off and on (more off than on). The formula we use to calculate the diversity is - 10000 / 240 = 41.66A (the 6mm² can handle that anyway) 41.66 - 10 = 31.66 x 0,3 = 9.5 + 10 = 19.5A. The circuit could handle 20kW.

A 'cooker' includes a hob and an oven. That's why the circuit is called a 'cooker circuit'.

Yes. Perfectly normal.

And stop using a hammer to make holes in the cabinet back.

Who wrote that? ...nor written by anyone with any authority. My point is that: The size of main bonding conductors was raised to 10mm² because the DNOs failed to maintain their cables properly so that the main bonding conductor might have to conduct high current in the event of a fault. If...

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