Do you have a link to that Mini EV group, Exonian?
I've found one (albeit very) minor niggle: The rear view mirror is positioned low on the windscreen and interferes with forward vision on left-hand bends and corners. That's it, nothing else!
On the issue of range, I've not calculated total range available, as it's so far been a non-issue for me. But I thought it might be useful to quantify for others. So I jumped on gmap pedometer and measured my usual daily trip: 23kms. This has consistently used 10% of the Mini's battery, irrespective of starting point (ie. 100% charged or less). So extrapolating that, I'd expect total range in my usual circumstances to be ~230kms. Which is spot-on the WLTP estimate of 232kms. Bear in mind that is in Summer useage with little heater or aircon use.
I think most online testers complaining of the range go by the Mini's guess-o-meter in the main instrument display, which is notoriously inaccurate and even more pessimistic than me. Mine usually shows 160-170kms available at 100% charge.