good cars have had a few

look for

electric windows get sticky/stop working/return on auto close
rust on rear arches and bootlid where you'd open it with you hand (under num plate)
flickering odometer, no big deal as usual ok once warm

nikasil is massively exaggerated on forums, check on 97/98 cars does it smoke, drive with sunroof tilt open and you'd smell burning oil, or, on tickeover, does it have a slight uneveness, (the windows will shake slightly if doors open (a compression test will show it up correctly)

other than that main thing really is to be sure its not clocked, these cars will easily get towards 200k miles, so check seat belts, steering wheel and pedals for wear if you dont have every mot and documented history even then you might not see it..

and obc's often get a bit flakey in the display.
and airbag warning lights tend to be pre-tensioners which are expensive