Wrote in message:
I've fixed fist-sized holes with a slodge of plaster on
piece of shiny cardboard pressed into the ceiling and
propped in place while it sets.

A hole your size I've done by carefully trimming the hole
back to the joists and screwing a carefully cut piece of
plasterboard and skimming over.

NB it's not a hole....yet!


And then there's the "panel it and make it look like a
feature" method: http://pics.mdfs.net/2020/05/200501s.jpg

Shurely that's the "who's put a bloody striplight right over the
loft hatch" approach...


--
Jimk


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