The answer will depend on who you ask and the parameters that you use I will give one exampleIt’s all confusing.something about 150kw charging power? I really know nothing about the various charging options. I just need to know that it will be more cost effective charging it on a 3 pin plug, than putting diesel in my current car .
If you kept the new electric car for seven years you could easily look up the average depreciation of electric cars over this time frame, you could then use this depreciation in your calculations so work out your buying price detract the depreciation and divide by seven for a yearly figure, use your average mileage and calculate an approx cost of charging, look up average maintenance costs over the seven years that should give you a broad figure to use against your current car.
If you are changing cars regardless so it’s a question of new diesel against new electric it’s going to get very difficult because the diesel could be really sort after if there is a ban on new diesel vehicles being built in the uk but it could easily go the other way so you find yourself with a car that nobody wants.
Interpret anyway you like, oh and if a new clean combustion fuel is found in that seven years that would probably significantly reduce the demand on the EV