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I'd be thinking 5 wire/2phase, did they ever USE that across the pond?????
I can't say it was never used in public distribution, but if it was it must have been confined to the early days.

LV distribution standardized pretty early on with 3-wire DC and 4-wire 3-phase wye AC.

Ryan,
If you're in the area, can you see if there is anything actually connected to that fifth (bottom) wire on the pole?