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My guess is it is the end of the run. With power off, ascertain which is the switch wire by putting a MM set to continuity across the red & black of each pair in turn.
Once you have found out the switched live, mark it with red tape. Now put the two reds together on their own. Then the remaining two are a neutral and switched live. And the earth of course.
Once you have found out the switched live, mark it with red tape. Now put the two reds together on their own. Then the remaining two are a neutral and switched live. And the earth of course.