[HandyAndy]

Get an OBDII dongle (I use Viecar 4.0) and free android app EvWatchdog. Check all the cells are within 0.2V of each other. See this thread for gory details.
A poor show

If the cell differences are 0.4V, maybe they haven't been balanced up for a while, so I'd want the seller to charge the car right to 100% on a 7kW Type-2 AC charger (Not a Rapid, BMS balancing may not happen on those, I can't be sure, but it definitely DOES happen on 100% SOC charge on an AC charger) and then read the cell voltages & differences.
Cell voltage should probably match the ones I posted, but there has been a BMS upgrade since then, so coulf be some tiny difference. You're also looking for close-to 100% SOH (state of health) but its a bit hard to make sense of some of the readings in these apps!

If the cell voltage differences (should be 0.2V max after a BMS balance) are 0.4V it might be ok, suggests a bit of degradation. O.6V or more I'd walk away.
CarScanner is another app, more detailed but a tad harder to setup & use.

Range at 100% SOC at this time of year should be at least 160 miles. Anything less, the guy's been caning it I reckon! 150 miles might be ok I suppose, never seen it that low myself! I reckon on 170-180 in winter, 200-210 summer.

 

[HandyAndy]

I like ACC, works well. LKK is a pain, doesn't cope with slip lanes/access lanes, any temp lines to do with roadworks/narrow lanes have it tugging at the wheel. Driving down country lanes with it on is dangerous imho - pull onto the verge to let oncoming past, and it tries to tug you back into the road as oter car goes past! I always turn it off.

Recalls - see here. Check if a vehicle, part or accessory has been recalled