I am afraid that where we get the electricity from in the UK specifically, cannot be ignored and will probably prove to be the stumbling block for the BEV if they ever become as popular as you suggest.
The following article states:
"Latest figures show there were 25.8 million licensed cars in the third quarter of 2015 compared with 25.2 million in the same period of 2014". An increase of 600,000 cars in one year on UK roads.
http://www.bbc.co.uk/news/uk-england-35312562
In my mind this raises some very important points:
1. If the numbers of BEVs on our roads increase sharply to replace at least some of these current ICE vehicles, how many power hungry rapid charging points would be required to service these vehicles. Think of the number of cars entering a leaving the average petrol station each hour. We would probably need large car parks every where with these rapid charging points to service demand, not to mention the infrastructure issues that that would create.
http://leadin.fi/blog/gas-guzzling-to-current-guzzling/
2. As it has been widely reported that our national electricity generating system is often working at very near to maximum capacity I doubt if a rapid increase in the numbers of BEVs could be/should be fully supported.
https://www.theguardian.com/big-ene...4/-sp-how-close-uk-power-blackout-energy-data
If there is any truth in these articles then IMO the BEVs popularity in the UK will be self limiting and it's future will continue only as a low volume alternative to hybrid or conventional but improved ICE vehicles. Unless our UK electricity generating capacity increases substantially in the near future then the costs of rapid charging will sooner or later rise substantially and that along with the delay to recharge will put people off buying BEVs, regardless of how green they are perceived to be.
Just my opinion.