Cheers for the article @wmcforum. I had seen a review awhile ago where they ran an iD3 until it ran out of battery power, they then called the RAC and they came out in a van which was fitted with a system to recharge your car with enough charge to get you to a chargepoint. Below is a link to a RAC YouTube video.
I still wouldn’t want to be silly enough to let my battery get that low.
https://www.youtube.com/watch?v=C9GlDfo6jx0&feature=youtu.be