Measure in from the access hatch below and then from above.
Failing that, small masonry drill bit. It'll go through the plaster of the ceiling but not, the wooden joist. Try and repeat, until you hit something. Note, the ceiling pendant will likely be attached to a joist and then, 400mm (?) intervals away from this is a good starter.
Good call.
A house we bought, the previous owners had built the studding on to the carpet! Amongst other pretty serious bodges we continue to discover years later.
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