I know it feels like UK, being such a small land mass, population and small percentage of global emissions, doing stuff wouldn't matter.
But if every nation thinks this way, every person don't care what we leave to the next generation, would we see any progress?
Besides, it doesn't matter if UK bans sale of pure ICE in 2030, this is bigger than UK. Here are list of all the nations that have plans to ban different level of hybrid cars in 2020-2040. There is no way for this small nation to continue function if the EV infrastructure doesn't catch up while supply of fossil fuel vehicles dry up.
https://en.wikipedia.org/wiki/Phase-out_of_fossil_fuel_vehicles#Countries
Change is indeed very difficult. but it's not the reason to give up. The more pure EV's on the road and plugged in when parked, the faster we (human) reach climate change goals. EV's pollute less as it ages because electrical grid gets cleaned up, smart charging EV's are a valuable asset to allow higher renewable utilisation.
I've said this many times, EV batteries are part of renewable solution. Just need to change the mindset of central location refueling.