I have to disagree with gothitjulie. For most PHEVs an ordinary 13A socket will allow overnight charging at 10A. Perhaps 6 hours rather than 4 hours on a special wall charger. When you move to a full EV, as things stand, Motability will pay for a 7kW (32A) charger. Getting a outdoor 13A socket fitted will cost very little.
Or, you could do something else entirely & install a 32A commando socket rather than a 13A socket, and you can then use a 16A granny charger without melting things (use a 32A commando to schuko adapter cable & buy a schuko plugged granny charger as they are cheaper than a specific 13A UK plug one), run a 7kW OHME commando plugged charger once you go to full EV (hint: Octopus occasionally do a deal on the OHME charger, it’s usually £200 through them but they have days when it’s £100). I have things like a 32A commando to two 13A three pin UK plugs adapter cable for wheelchair in car charging & lawnmower/jetwasher etc., use, it’s a much more useful & flexible system than a type 2 socket just for EV charging, but not everyone needs such a system.