How hard can it be?

Plug it in and then come back in a few hours.
Well, I plugged in the MF* and immediately there was a message displayed on the screen of the Octopussy 7.4KW Zappi charger....WAITING FOR SURPLUS.
Absolutely no idea as to the meaning of this message so decided to pull the plug out and then try again, in a few minutes.
But of course, the plug refused to be removed even when repeatedly pressing the black release button. WTF.

An hour, and two bottles of Stella later I was finally able to release the plug. Presumably it was linked to some sort of timer.
Anyway, it seems I was trying to charge the MF using 'Eco mode' which I later found runs on power generated by solar panels, recycled tampons, and dead puppies. You know, ECO stuff.........none of which I had to hand.
Eventually I figured out the menu on the Zappi, and using 'fast' the MF charged without any further problems.
PS....MF* in the context of this thread stands for 'Milk float' and not 'mother f*ucker'

....despite me saying these words many times.