1. Provided you don’t renew your ‘contract’ or move to another provider (both events likely to require taking FTTP ) you can stay on the copper pair service for a while , possibly years , there is no way to know exactly but there no imminent risk to your copper service being removed, if the exchange is not a FTTP priority one then you may find a new copper broadband supplier , but most will offer FTTP as the default now it’s showing as available.
2.Yes any repairs to duct the ground excavated is reinstated , with some surfaces this may leave little or no evidence (like block paving for example, relaying the blocks should leave no evidence of then being lifted in the first place ) , but other surfaces like imprinted concrete or resin bonded can’t be restored invisibly so a scar/witness marks are inevitable and you won’t get the entire driveway replaced, if this is ‘new’ work , it’s likely they damaged the duct , you could ask them to return and fix the damaged duct or agree to replace the driveway once OR clear the duct stoppage.
