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I'd also put some dust sheets down and clear the area a bit, just on the off chance it does come down when you're screwing it back.
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Of course you do rely on feel to see how much good you can do with the screws, Sometimes I might use a plasterboard jack to push the ceiling up or make something with a board and a long piece of wood.
There must be quite a few tutorials about it online. I only offer it as a possible route out of much larger works in case you are lucky.
I don't usually manually recess the washers, as long as you have a decent grip in the joist it should be possible to nip them up. Then tape the remaining crack as well.
Nef
Airhead
@hugo7
As to the general condition, it cracked over the weekend. It was previously warped. But I'll have another look. I assume it's just another couple of screws in the other places it's lifted, provided it's not too extreme?
Also cheers for the reply!