I don't think that's quite accurate.

Flats and terraced homes aren't the majority - about 55% of people live in detached or semi-detached houses. See the ONS Census data at https://www.ons.gov.uk/peoplepopulationandcommunity/housing/...

My terraced house has off-street parking, as do most of them in my area.

Houses with separate garages are also fairly easy to upgrade - we had an armoured cable buried in a new trench to connect our old property.

Similarly, most flats with car-parks are especially easy to add chargers to. They can either be 7kW points or just regular plugs. We had slow chargers installed in our old flat.

Yes, there are many properties with no easy way to add charging. But none of those places have a petrol pump attached either.