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havent see anything like that either, our floorplan is super wierd, and the houses were built by an architect quite purposely fully so its likely its maybe hidden somewhere
floor plan below with red box being where the current termination is (5c box so relatively modern), green is where everything else comes into the house, gas, elec etc.. but nothing in there that looks like BT stuff
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What does the junction box look like? Something like the below? You might have a really old direct buried cable which could come up anywhere. You would have to follow the cable with a tone probe or something