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Generally easily avoided with double bootlace ferrules or blade/fork lugs used back to back.

Without pictures it's not that clear what you are doing, but it all seems a lot of effort to replace a bit of conduit. Can you not just thread a bit of T and E through, in a plastic conduit if you prefer?

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Best avoided, but I daresay the house won't collapse. Best to put the holes in the centre of a beam if unavoidable.

A CW gland is the correct gland for terminating SWA outside. Yes, you could use a nylon stuffing gland, but that would be nasty. Just use the correct gland and don't connect the gland body to earth.

Clipping the cables would go a long way to making it prettier, and would provide some strain relief for the cables entering that round JB.

A UK 3 phase supply would not be 480V line voltage, so must be from a split phase transformer. Is it a farm?

Joints must be either maintenance free, or accessible for inspection and test. Google maintenance free junction box if that's what you decide to do.

Many things are circuit breakers. Some are minature, some are moulded case, some are RCBO's. It's quite a leap to say that MCB is no longer the correct terminology just because the "circuit breaker" term is used in the big book.

Maybe not by the IET? But they still called MCB's by most. Are they not referred to as MCB's in the 17th edition?

Glands look close together, sure you get a spanner on?

Banjos aren't a bad idea, there are gazillions of them in use, but the electrical connection between gland body and banjo is made by compressing the banjo between jb and gland nut, and there are some that believe they come loose over time. Why solder rather than nut bolt and ring crimp? 10mm...

Don't think the box move is notifiable. Plastic jb is fine. I personally prefer CW glands, but BW are adequate here. Armour should be connected to earth at the jb end only, use piranha nuts rather than banjos. T and E doesn't need glanding, but it must be restrained. Personally, I would...

Permanent live to A1 and to 15, permanent neutral to A2, original live to pump to Y1, new live to pump to 18. Timer function to E according to the data sheet.

But need to clarify if you can use 3C and E instead of T and E, and how to use it. Do you have a copy of the regs? Have you done any practical work or calculations based on their contents?

Most, if not all, non pneumatic off delay relays have a permanent supply and the switched supply.

It's not my relay, I'm just another poster like your good self. I found a separate photo of the schematic printed on the relay. L and N are the permanent supply to the relay, 1 and 2 are the off delay contact.

Ok. Why do you think the permanent live goes on 1, it's connected to L on the schematic printed on the relay, and the switch contact is 1 / 2.

Both drawings are the same?

Don't think your sketch is quite correct, L on relay should be connected to permanent live, original live to pump to 2, new off delayed live to pump to 1.