Thanks for all the responses so far, great to have other viewpoints. Cameras don’t always pick up what you need them to that’s for sure, but I was constantly looking for problems in the plaster that might affect the final finish, in fact the plasterer was very upfront with where might be an issue (old house, old walls) but the work he did on the enclosure I didn’t see any issues with. Maybe because I’m neither a plasterer or tiler that may be the reason but I can’t believe this wasn’t avoidable.
In case it’s in doubt, there is a definite convex bulge on the tiles on the left, if I put a straight edge over it, it rocks between the two angles.
I’ll speak to him today and see what he says.