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At some point the loft was converted into a bedroom, en-suite and dressing room. Then they put a wetroom style floor in over the junction? splitter? box. So that’s been moved to under an accessible part of the landing, but he couldn’t feed the last cable through to it as there are no channels or holes in one of the joists. So this was the easiest/ quickest/ cheapest option.
Californian patch? Now you tell me ;)
Look up California Patch
Also why did they make a hole in the ceiling?