If you have to pay for a charger to be installed at your partner’s address then there are alternative chargers of course and you’d hopefully get the OLEV grant. It’s worth considering a smart charger if your partner has a smart meter as then it’s possible to use a tariff that could cut the cost of the electricity you use on the car. The smart charger would charge the car at the times when electricity is cheapest on that tariff.
Then there’s the non-OLEV grant way where you get an electrician to install a 32A commando socket & you use an OHME cable (it has the smart electronics) so you can plug in elsewhere if there’s a 32A commando socket….
A good read of the General Charging Discussion section of http://www.speakev.com/forums/ will give you all the information that is available on chargers.