1920s house. The house has had some building work done, including removal of a (supposedly) non-load-bearing wall in the kitchen which is under the bathroom. This was done by the previous owner (who was apparently a total idiot) so I've always felt uncertain about the underlying quality of the work.
We've lived here about 5 years, there have always been a few cracks in the plaster of the bathroom ceiling. Last year I vaguely noticed they seemed to be increasing in number/severity. We discussed getting someone in to look at it, then COVID happened. Today I was staring up at the ceiling while brushing my teeth and I pretty sure the cracks have further increased in number/severity. They're not huge wide cracks, but there seem to be more and more of them and getting wider (the biggest now about 3mm) and longer too.
I have never been in the loft space - it's only a tiny hatch with no ladder, not boarded so unusable. According to the surveyor's report there is a water tank in the loft space over the bathroom.
What sort of tradesperson would be appropriate? I was thinking just a general builder or roofer, but because of the kitchen wall removal perhaps I should call a structural engineer?