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You can still buy it like that the one with the cpc is 6241Y and without is 6181Y.

There may not be a break, it might never have been a ring final but it is easy to establish by testing.

They should have established where the apparent break was by testing.

It used to be I don't know if it is still the case that if alterations by their nature changed the Standard in such a way that you must produce a new edition. What that such a way was I couldn't tell you. Probably in BS0 the Standard to which other Standards must adhere to.

Your TT becomes a separate system with your earth fault loop path using the electrode. It no longer relies on the main installation earth so that is not part of your TT Zs.

One of the black conductors at the intermediate isn't identified as with the greys.

The "loop" doesn't play a part in the circuit switching as such. With switches it is normally used for the neutrals which are now commonly connected through switches for future smart options.

Good video that.

I enjoyed the initial Jodie Whittaker episodes but then they turned her into some kind of hyperactive *****.

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Been watching this for years although I skipped most of Sylvester McCoy. Watched the Christmas episode but seeing him in a skirt I thought nope no more. I agree a box ticking exercise and shan't even have a gander.

Something has happened and yes it is a clear break. It should be investigated and if it cannot be rectified split across two separate 20A devices.

If you need any sort of guide you shouldn't be doing it.

Depends how many KW the heaters are, up to 2KW then 10A is fine.

How many KW are the heaters 10A is probably fine.

Probably wasting your time. The chances of it being free from conductive parts of the electrical installation is probably zero especially if the steelwork is the main structure as opposed to a small "floating" part.

It is a functional switch therefore it should be capable of that function. Small gentle tap with a smallish hammer normally resolves it then remove the flaked paint. 5.18 of the Inspection Schedule, Condition of accessories............. is relevant.

Don't worry about it I don't.

It is annoying I got one wrong on my 2391 but they couldn't tell me which one just that one was wrong.

Not sure how any of this helps the OP.