63 Amp should be okay as it'll be charged using the 3 pin granny charger on a 2.5mm radial with one socket and a 20amp rcbo (It's the single external socket on the property)
Also charging will be done when there's almost zero load
Might contact the DNO to see if I can get a 80 amp upgrade
I'm not planning on a EV socket installation, I believe a lot of those need an earth rod?
Things are changing all the time see BS7671 amendment 1
The initial charging units did need an Earth Rod, though more recently many have a device that monitors the Presence of the Neutral and has relays that cut off the Supply in the event of it being Lost.
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