The problem with the lack of expanding charging networks is much the same with everything in the UK?
Take a look at networks maps for 4G and 5G for the UK against nearly every other advance nation on Earth and you will see ours looks like a Swiss cheese in comparison.
Now the mobile phone companies that operate in the UK are much the same, if not, are the same that operate abroad and looking at the networks aboard there miles ahead of our networks.
The only reason there could be for that is the good old British ethos of spend as little money as you can to get as much money as you can back in return.
Much is the same for EV charging infrastructure i.e. I’m only going to spend a million if I get a billion back by the end of the year.
Just my thoughts.