You have stated something a little contradictory, if the network construction work you enquired about wasn't for Openreach but a competitor, then unless OR have also provided a FTTP network without you noticing then it’s not clear how BT can be offering FTTP .
If you change to FTTP from a competitor not using Openreach, apart from considering the potential early termination charges for leaving BT early , the competitor will put up a fibre cable alongside the existing OR copper cable , if BT ( or a company that users Openreach ) can provide FTTP chances are the old copper drop-wire will be taken down at the same time as the optical cable is put up ,basically only OR can touch OR dropwires , competitors are allowed access to Openreach poles and ducts etc ,not wires .
FYI , is much more to FTTP than swapping a copper wire to an optical cable though .
