Couldn't agree the finance though with the dealer, so I came home and went to car wow. The E:NY1 Advance (so not the Elegance trim that we looked at originally) plus the nicer alloys and the obsidian blue paint..... with a smaller deposit, came back at
£259 a month. Brand new, free delivery (dealership here added an additioanl £840 charge on for delivery), includes the mats for free (again the dealership here also wanted to charge for), 0% apr, and the 5 year care pack.
The dealership here wanted £357.
That £259 a month saves my parents £71 a month (£852 a year). To fill the XC60 is also costing £70 a tank and returning about 26mpg. I think charging the E:NY1 will be ~£20. No road tax until next year.