Again, the National Grid seem to suggest we already have enough supply for the EV transition.
Citation, please?
https://www.nationalgrid.com/stories/journey-to-net-zero/5-myths-about-electric-vehicles-busted
to cut a long story short, getting rid of CRTs switching to LED lightbulbs and the loss of some heavy industry means that if every car went EV overnight we would only be using a similar amount of electricity as we did in the early 2000s