3-pin EV socket
Charge safe
One of the best things about EVs is that you can charge up from any socket...
See it on Amazon UK
See it on Amazon USA
...Except if you're planning on charging for a long period of time, you really need a suitable socket. Why? Because otherwise you could end up overheating the socket and causing a fire risk. In the UK that means using a BS1363-2 socket (it'll have "EV" written on the back). These are designed for a 10 amp load for an extended period of time. They're cheap so it's really a no-brainer if you're going to be using your granny/portable/3-pin charger.
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