Was thinking that one could use the plug to start with.. it would come off the garage supply so expect 30 amp load.
I'm charging with a 3 pin plug, waiting for my charger installation on the 10th of this month.
Managing well so far but I plug in as soon as I get home. In the unlikely event that you ran the battery right down I'd think it would take a couple of days to charge fully on a 3 pin supply.
Next step, for me, is to decide which of the Octopus EV tariffs to choose.