The cost of public charging is still one of the biggest problems. I'm currently on a night-time charging tariff at home at 4p/kWh. It will go up to 8p/kWh in October but that's still pretty good considering it's not uncommon for public rapid charging to be 10x that.

Of all the rapid charging networks, I find Tesla are often the cheapest, there are Tesla 250kW charging stations near me that are 33p/kWh during quieter hours.