A further 11 days on and FTTP is installed and working. The spurious pole remains unused...
I have had a reply from the pole complaint team and they agree that, on the face of it, the pole siting is a bit strange. They've referred it to the local build manager...
Aquiss FTTP | AAISP VOIP | Ubiquiti UDM Pro | 2x Unifi AC-Lite & 1x AC-LR Wifi AP