In the UK, in London at least, they're starting to put in more and more ~4-5KW chargers on the electric street lamps/lamp posts.

So far its like 1 or 2 a street (and not all streets either), but hopefully one day it will basically be all of them in every street so you don't need to worry.

So if you need to park overnight on the street anyway, park next to a lamp post that has the socket. Its "slow" charging at 4 to 5 KW, but if you're parked for 8-12 hours (while you are asleep), that is quite a considerable top-up in the 40-50KWh range.