If you shop around and get quotes of small companies, sole traders its possible to get a 7kw home charger installed for around £750/£800 slightly cheaper for a 3,4kW charger.
A type 1 (granny charger) would be your best and cheapest option and can be powered from an outside weatherproof socket. As the name suggests it’s slooow to charge, which could take 7-8 hours to charge a PHEV battery that as little charge in and if you use the majority of the battery capacity every day it will become a chore.