I hope to move into a bungalow around the end of January.
The entrance is to one side of the building, about halfway up.
I would have expected to find the incoming BT line not far from the front
door. I would want to position my wireless router there

BUT, I found a hefty (ugly) double socket on what formerly was the rear
wall of the lounge. There is a conservatory on the other side of wall.

Is it likely that this is the oroginal site of the master socket?
Unfortunely, owing to the lockdown I cannot arrange get in there to
scratch around.

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Mint 20.0, kernel 5.4.0-45-generic, Cinnamon 4.6.7
running on an AMD Phenom II X4 Black edition processor with 8GB of DRAM.