I take it all back, I think!
I went for another nose around, and the ducting actually is black. The pole has a "danger of death" badge as well.
Interestingly it branches off to other poles, some of which have thick black cables (electricity?) going to houses, and also, rising out of the ground initially, what are certainly telecom drop wires.
Is it usual for poles to carry both utilities?
So, I suspect that the ducting is to bring power to the cab. Is this usually covered in the BT planned works, or should I be looking out for separate electrical works?
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Fritz!Box 3390