Extrapolating that data, the current rate is approx 400/week = 8800 per year. Significantly higher than the "7000 over 3 years" that the article cites - I am sure that's not incorrect, it's just that it's old data now, plus putting the number over 3 years carefully hides that probably it was something like 1000 in year 1, 2000 in year 2 and 4000 in year 3. "7000 over 3 years" makes people think they're being installed at 2300 per year, rather than the accelerating rate that actually underlies the data.
The 50% that don't have access to cheap charging at home need much more consideration. So planners need to accelerate work place charging facilities and charging in other places where we park our cars like railway stations and town centre car parks for shop and office workers.
Hang on, what planners.
Actually average mileage is nearer 7k a year, even before Covid, so that is some small relief.. The reduction in commuting and business travel as a result of changed practices post-Covid may also dampen down mileage. (Checked..7,400 in 2019)