You have loads of options. Many large supermarkets now have EV charging spaces that you can use for free. The same goes for workplaces and train stations.
There are also few different charging networks in the UK that you can pay to use. Some let you pay as you go and some require a subscription. Chargepoint, InstaVolt and Podpoint are a few of the larger ones. Tesla has their own network which includes Superchargers that can get you almost full in 30 minutes.