P.S. In that last pic, my conduit is level, but unfortunately the ceiling and blockwork are not! What can you do?
That's the point where I usually decide to put my stuff parallel with the building instead of level. Just looks better.
For example, almost all of the light switches are slanted here... but no one notices because they are parallel to the door frames. Had I put them in level everything would look crooked.
It's interesting... that kind of conduit clamps and round junction boxes went out of favor here decades ago. The saddle clamps are still sold, but I haven't managed to find such boxes. Only square 10 and 12 cm (and larger of course).
