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Just confirmed my initial thinking at the time. Had a plasterer come round to have a look. The whole side of the house is like that.
I think I might just tackle it in my own. So I’ll just need plasterboard screws and scrim tapeI’ll try skim it myself. Any recommendations as to what I can use?
musa-
You can use multi finish plaster (the pink stuff). It works well with plasterboard. It does need a certain touch to finish it properly though. You can use the multi finish and leave a fairly rough finish then use TX110 and sand the whole lot, coat it with Gardz and paint or line and paint. If you're lucky with the plasterboard thickness matching the gap then you could use scrim tape and TX110 or a softer filler like easy fill, I would prefer TX110 as long as I wasn't using big quantities.
Airhead
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.