Aaaaaaand ... I did! ?
It was a white SE SR model - had it for a good 20+ minutes. As I'd never driven an EV before I wasn't sure what to expect, but is was very easy. (Like an automatic but without gear changes).
I found regen level 3 to be more than enough, though I also tried it with adaptive regen. (I'd probably stay with Normal mode and Regen 3). I didn't press the brake hard enough to test the auto-hold, but from a gentle stop when you lift off the brake the car will creep like a typical automatic - I actually liked this.
The seats were very comfortable - more comfortable than the ones in my 67 plate Insignia Grand Sport, and I could setup the driver's seat and steering wheel just as I liked very easily. When driving my left knee easily rested against the centre console and was comfortable.
I didn't cable up my phone but I left it on the shelf for the duration of the test drive and it didn't move - the gel case on it probably helped.
I didn't find anything I didn't like - even the rear view was fine for me (I tend to have the driver's seat higher and more upright), and I didn't miss the rear wiper. (We had some wet roads on the test and there was no noticeable spray coming up).
I'm sure I'll remember other things in the fullness of time. So the $64k question is - would I buy one? Well - yes - I did. SE SR in Camden Grey, and it'll arrive with me before the end of this month. (It's one of the cars on the Grand Venus I believe).
I also decided to take their service plan ... £399 for 3 years including an MOT.