Electric cars are ridiculously efficient. A 100kwh tesla drives approx 500km. So 50km/day/car needs just 10kwh. The UK also has 2 persons per car (plus additional cats and dogs..)
So just the on-shore book projection is already enough AND only requires a tenth of the turbines.
Lets keep nuclear as well. Invest in efficiency. Lots of hard work ahead.
But we are probably closer to "problem solved" than to "civilization collapse". Cheers.