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So I can assume cable calcs are being made based on 230v now? Used to be 240v and so would have been 12.5A.

I've had a rethink and will take the supply to the boiler in a spur from the downstairs ring and give the immersion it's own supply as recommended. I was only considering it as the boiler is below the HW cylinder and I was thinking of using the nearby socket for a spur to something else. I...

I could pull it in to the ring but it would be a lot more work. I can access the conduit to a nearby socket from below if I take down a sheet of plasterboard. Is there any reason not to put 3x flat t&e 2.5's in 20mm plastic conduit apart from they won't fit easily? Thanks

Thanks. That's what I was thinking. But hoped someone would say 'no problem' as I will have to try to get 3x 2.5's into 400mm of 20mm conduit or make holes to get into the upstairs ring.

Of course. Fused switched spur.

Is it bad practice for a 3A supply for a boiler and a 13A supply for a 3KW domestic immersion to be on the same RCD protected 16A MCB? If ok would it then be advisable to fit a 20A DP switch to the immersion so it could be fully insulated if a fault arose and then the boiler could still...

Is it wrong to run a 2.5mm t&e spur off of the RCD protected downstairs ring to supply a shower pump on the first floor? It would be easier for me at this point but I'm not sure it would be 'good practice'. ie a circuit downstairs feeding something upstairs? Thanks.

Deleted - Too many questions and too much info.