is it downstairs or up?
if up then i'd pull cables into loft space, jb them and feed a new switched live/neutral/cpc to my two new lights, make sure new ceiling allows enough room for them, 110mm for fire-rated, or click do a range which are 65mm, they should be used if the room above is habitable, i.e. bedroom
if downstairs use the same method jb under floor above, mark floorboard, maybe even write on exposed grey cable at new light 'jb above' for the future