the service history has sort of been stuck to having not exceeded 12k miles between services, although it should have been serviced every 12 months or every 12k miles, whichever comes first.
certainly every 3 years the camblet should have been every 3 years or 36k miles so its more than likely overdue a belt job by now for certain, so keep this in mind with price.
keep an eye on the engine temp when your driving and make sure it has plenty of time to warm up, it should sit just short of 90 degrees when driving down the road, let alone in traffic. if it doesnt get that warm its new thermostat job. if the stat is worn out then take a look at the rad too see if it feels soft and crumbly, they only last about 5 years so it could be on its way out.
also see if you can find a bit of a bumpy around to go down to see if its rattly / knocking / squeaking over bumps.
the front suspension often suffers on the 147 / 156 so maybe the arms need replacing, at worst the ARB may need replacing to but it should be okay at that age.
1999 156 1.8TS Sport Pack 3
2001 166 3.0 V6 24V Super
2003 156 GTA 3.2 V6 24V
2005 156 1.9 JTDM-Jet Sport
2008 159 1.9 JTDM Lusso
1997 GTV 2.0TS Lusso
2001 147 1.6TS Lusso