I contacted BP Chargemaster for a home charger you are right they are absolute cretins I just put the phone down and contacted Podpoint ours is a PHEV so we to had to contribute toward the home charger (£290 for a 7kWh unit with a dedicated lead with Podpoint).
Just filled in the online forms along with some photos of my iPhone and payment, the Podpoint has some clever electronics it can measure the current being drawn adjust the charge rate accordingly.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.