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Can you move another 400mm away from your neighbour?! That would simplify things greatly.

A while ago my next door neighbour locked themselves out of the house. After a while it was decided to break a window at the back to gain entry. I was voted for the job. It took over 5 minutes with a hammer to get through the triple glazing.

Mid sections of pipe runs not haunched? To prevent deflection. Foreign objects like a 1/3 of a patio slab or a house brick, visible when migrating the spoil and back-filling.

Apply a good few coats of primer / water solution on to it a few days before tiling, to ‘size’ the surface and reduce it’s porosity. Mix up some 75% water 25% primer and give it a good few lashings, a couple of hours apart, and you’ll soon see the board becoming saturated. Apply some neat a day or two before tiling, and then tile on to freshly applied wet, neat primer.

If you've got 2 single phase supplies to the HP then you can use a single 4 pole isolator. I ran our data/control cables through the wall tie wrapped out of sight to the outside of the return pipe insulation. The mains supply came via a surface mounted SWA cable

You make a good point about the skills you have, I accept that. The regs have become a lot more stringent particularly in relation to portal frames on or near boundaries. Best thing you can do is to give your SE a call and discuss.

Google says.. Minimum Dimensions: Both the clear opening width and height must be at least 450mm. Total Area: The clear openable area must be at least 0.33m^2. If you make the opening width the minimum 450mm, the height must be at least 735mm to 750mm to hit the area required. Height: The bottom of the openable area should be no more than 1,100mm (1.1m) above the internal floor level for safe access.