That's not good, and the loan car a bit of an odd choice. Similar size I guess.
Three thoughts:Call from the dealer today - they think that a controller unit is out of date compared to the other new parts they have fitted. A new part has been ordered, but they are unsure as yet when it will be in. They'll then fit this part and see if it rapid charges and knows how much charge it has.
What I don't like is when they take it in for repair, the first thing they do is fully charge it and then leave it fully charged.
Next May I can hand the car back... If it still continues to be troublesome, I will be doing just that I think. And I'll definitely know not to buy a VW Polo 1.2 60PS!