If it’s Openreach, then the poles will be marked as BT or possibly OR , and should have a notice attached outlining the objection process, so it should be easy to determine if it’s an Alt Net or not .
Generally, if an area is currently completely underground served ( so anything built from the 1960’s onwards ) poles are not used in these area ( without a full consultation with the council and local residents ) but in a mixed area , so some older properties that already existed and were already served overhead , it can be justified adding additional poling ,generally if you can already see poles , any objections about extra poling can be argued against, poles are the easiest and cheapest way to provide FTTP ( unless it’s a fully ducted area , built from the 1990’s ) .
If the poles are Openreach assets, then it is almost certainly a precursor to FTTP availability, but the poles could be installed many months before the service is available to order , it’s when the fibre cables and CBT’s appear that you should keep an eye on the availability checkers, if it’s Alt Net poles they appear to do whatever they want and are not bound by BT/Openreach conventions.
