Doesn’t really matter if it’s 5 or 10 useable EV’s avialable for under or around 30k.
The main point is local authorities around the country are introducing these clean air zone’s with the aim of pushing those on low incomes onto on to public transport, without increasing the provision of said transport.
It is in fact a wealth tax on the working poor, most people who drive older polluting vehicles do so becuase they cannot afford anything better, while those more affluent who can afford newer less polluting vehicles will not be affected.