@MM5 It sounds as though you are agonising over your choice! I would urge caution in listening to comments like “there are zero downsides to an EV” as that’s simply not true. There are pros and cons with ALL car types, whether that’s EV’s or ICE cars. We have a PHEV and there are downsides to them as well (our mpg when the battery is depleted is poor).
As you can charge at home, your biggest barrier to EV ownership has been overcome. It’s a brave person who gets one relying 100% on public chargers, but that wouldn’t be your situation. Out of interest, why are you asking about having the charger fitted at a relatives house if you can charge at home? The second big issue to answer before getting an EV is how often do you do longer journeys, where you’d need to charge away from home? To assist in your thinking, I’d assume the absolute worst when it comes to range and assume that the car might only do two thirds of its claimed range (as, unfortunately, that is the case with the worst EVs in the winter). Work out what worst case range that gives you and then ask yourself how often do you make journeys that exceed that? If it’s once in a blue moon, then I think your fears of getting an EV are unfounded. You would be suited to one and would save a fortune based on your current highly uneconomical car. If you make infrequent longer journeys and don’t mind stopping for several times longer than you would if you were just putting petrol or diesel in, then an EV would still make a great deal of sense to you.
Ultimately though, only you can determine what is right for you. There’s always a risk. I went for a PHEV and 3 months in the jury is still out on whether I’ve done the right thing or whether I’d have been better off sticking with petrol (running costs aren’t my number one consideration)!