This audit put the number of overnight parking spots at "on-site locations" within 5km of the strategic road network (so not even the whole country) at 16,761. With the remainder of the report concluding that the usage was at or above capacity in much of the country.

https://assets.publishing.service.gov.uk/media/6454ab292f622...

Milence's first site in the UK, opened in March this year, provides 8 charging bays with 4 chargers shared between them. So to provide a similar number of overnight parking spots a further 2000 need to be built. Or to put it another way, these charging stations would need to be approximately as frequent as McDonald's restaurants in the UK. Not accounting for the areas of the country located further away from the strategic road network and the other 35% of the vehicles they surveyed parked in lay-bys and industrial estates.