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OK. Here is the standard UK wiring diagram for a pendant. With three lamps you will have three lives and neutrals going into connection 1 and 8.
Be absolutely sure what cables you need for live 3 to 5 and neutral 6 to 7.
They might be red and black or brown and blue. Some might be red/brown or black/blue with sleeving in opposite colours. Or not sleeved at all.
If you have any confusion get a qualified sparks to do it.
They are usually prewired so it'll be the same wiring layout as a normal pendant.