Hi misterg, take supply from room pendant, if wanted on with existing lights then connect to same terms as existing flex(unlikely),or if you want to put in local sw then connect to N + loop-in Lives at pendant & run to new sw. position, also loop from (new) light to light & take last cable to new sw. also.
At new sw. loop both BLUES (neutrals ) in term. block in sw. box, put live in to C in sw. & sw.Line out to lights in L1, earths together in term block,
regards SPARX
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