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That's the point where I usually decide to put my stuff parallel with the building instead of level.
I use that approach sometimes, but in this building there are just places where no matter how it's aligned it's going to look out of whack with something.

That former-W.C./now-kitchen area is a prime example: The ceiling twists and slopes in both planes, the rear wall is neither vertical nor flat, no corners are 90 degrees, and the two side walls aren't anywhere near parallel. The blockwork in that rear store runs straight for a while, then takes a nosedive.

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Man, what a difference white conduit makes, over the grey stuff most commonly used here.
The type of conduit I used is available in black and white.

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Did you use 2+E cables or conduit wires inside the conduit?.
Conduit singles. Running T&E in conduit isn't a normal installation method here, except for where a short length ofconduit is being used for extra mechanical protection.