Well, some test drives today sorts a few things.
Both cars were grey, 60 odd thou on the clocks, T-spirit Gen 3 Prius'. 1 car had mismatched tyres all round and some quite bad stone chips on the bonnet (like a lot, down to the white). Same car had a very dirty engine bay. Car 2 had some billy-no-brand tyres on the front that looked like they were perishing. The brakes could have done with a good clean as well (rusty and decent lip on the front discs so don't know how much life is left). Car was also flat (12V batt flat) but once jumped, it was fine. Both cars seemed to have healthy HV packs with around 212 Volts and <0.05V cell differences.
Drove them both. Both drove very well; smooth, quiet, easy. Really felt "at home" in one.
I have to say, comparing back to the Auris, I think I'd take the Prius any day of the week, it just feels more cohesive.
Absolutely loved all the different displays in the dash!
So thats it now.... I want a Prius and I think it's probably worth a little extra in the budget to get one.
ETA: Should you feel a bit of vibration through the wheel at motorway speed? I got up to 70 and I thought maybe it was a wheel imbalance, but then it felt more like the surface of the road coming through the column.
Unfortunately, both places with the cars didn't seem to keen to take my Abarth in PX. I can see why, it might be a bit hard for them to move on and it wouldn't appear in their valuation tools for some reason. So if I can't PX at a big dealer who can just punt out to auction i'll have to sell it privately/we-buy-any-car first.