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I live in Maida Vale where there are a lot of chargers including in the lamposts. I also have a fast charger 50KW opposite.
But there are also a lot of EVs.
When the charger (Ubtriicty) right outside my flat worked, everything was a breeze. I just park there when I could and top up...
Coming up to winter + performance car, I'd replace at 3mm in any case.
So at 4mm, don't mess about with a repair even if possible - just get new tyres.