I'm considering putting in an offer on a house but most rooms have cracked sections around the edge of the ceiling where the plasterboard seems to be pulling away from the walls. The property is a 3 storey terraced built in 2002. A couple of the rooms also have floor to ceiling cracks down the corners of the walls, the picture is the worst one. Will flexible filler do the trick or would I need to get something more advanced done to it? Trying to get an idea of the cost involved before deciding if and what to offer to buy it.