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It's better. I would try to get some plasterboard on the underlying wood. Maybe cut out a regular shape first and screw the plaster board to the joist. Then it would depend on movement in the surrounding area, if the rest of the plaster is solid up to the joist just skim the plasterboard, maybe use some jointing scrim on the edges. I would recommend lining on top of that though.
Apologies if I making it sound like a piece of plasterboard would be the easiest thing to get hold of these days. You might find some small abandoned pieces outside building sites or in a skip.
I’ve reuploaded it. If not better I’ll take one later.
The wall condition isn’t best but plaster hasn’t blown. It was lined and wallpaper previously. I’ve just painted it white for the time being.