Cracks in ceiling?

[HOL2024]

Any idea what’s caused this - I can’t tell if we need to get a structural engineer involved or if it’s just cosmetic.

Just looks like the coving coming away from the ceiling. The coving is just a bit of trim, made of the same stuff as plasterboard or sometimes even something like polystyrene: it's not in any way structural.

If there is a wider pattern of cracking extending onto the ceiling and/or wall, then post more pics, but what I can see there doesn't look like anything I'd be worrying about.

Are there cracks anywhere else? We has this and then realised there were small ones in a few other places and that was the start of realising our subsidence problem.

Just one more hairline that I can see in the landing. We did a conversion and had a door knocked through a wall so I assume that it must be the vibrations from that. Hoping that it’s nothing too major.

That last picture shows a straight line and perhaps you can make out the plasterboard tape. That’s just a crack where the plasterboard meets the next piece.