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There are probably (definitely) better qualified people than me, but if I were doing it (and I have done similar recently) I would knock/peel off anything obviously loose. If you tried, you'd probably end up taking the whole lot off. I went as far as I though would be OK without the rest coming off by itself. Then I tidied up the edge with a stanley knife, put a thin skim of filler over the area, sanded smooth and then painted. If you don't fill, the paint is unlikely to cover/mask the "step". I justified not doing the whole area as it didn't seem like it would come off of its own accord and if it does, then I'll do it properly (strip everything and redo). This way if it works, it's a nice cheap and easy fix.
Any help appreciated.
I’ve removed some wire trunking and th plaster coat perhaps(??) has peeled away in areas. I’m now reading about skim coating .
Questions:
Thanks in advance (ignore black tape, just there temporarily to hold wires now I’ve removed trunking)