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@wvm
Back to the wiring in the ceiling I guess you've got loop in wiring where the live and neutral come from the fuseboard into the first light fitting, out to the next and so on through all the lights. This accounts for 2 pairs of red and black wires. The third pair will go to your light switch and the black wire is actually the switched live and should be identified by maybe some red tape round it.
Perhaps there's some 'issues' here?