If the SNN ( survey network note ) is for your address, it clearly shows ‘Overhead’ .
Single Dwelling Unit Residential OH Feed with no anticipated issues.
Your cautious language regarding Openreach not having a forum to ask questions, suggests it isn’t BT that you have used to provide service but some other ISP , if that’s the case you are in the wrong place , your questions are nothing to do with BT .
FYI , it’s irrelevant if the previous copper pair service was underground via a buried armoured cable, there is no compulsion for Openreach to stay underground, ( although they usually do ) but if there is an overhead solution OR can and do use that , you can get a property on the boundary between an underground DIG ‘estate’ and an older ‘overhead’ served area , so a DIG property could be served overhead in a small number of cases , the majority of the DIG properties won’t show availability, just those that can ‘see’ the pole originally designed to serve older properties.
OR have the option to put up new poles in DIG areas ( same as some alternative networks do ) as a cost effective solution to DIG areas , but I’d suggest in your case there was already a pole existing and your underground service was something of an anomaly, there is the option ( that the customer pays for ) to transfer overhead to underground service, it’s possible that your underground service was because a previous occupant paid to have an underground service when the overhead service was the default, or you address has access to overhead as it’s close by this overhead network ….obviously if you want an underground service and are prepared to pay to get that , it’s an option, but a potentially very expensive one.
You definitely won’t get OR to provide underground service for ‘free’ if an overhead option is available, if overhead isn’t acceptable, your order will be cancelled.
