This may not be for you so apologies....We have a large crack in the ceiling which could be from historic subsidance and more looking for advice ....The crack is along the edge of the upstair ceiling and outside wall....goes the whole way along in the hallway but not into the bathroom or bedroom....I suspect historic and any advice would be appreciated ....Looking to just plaster over it
looks like rough plastering job knowing it was going to be covered with coving. plaster it and watch if it moves. if it doesnt then relax