High mileage is not necessarily a problem so long as it's been well maintained. Service interval for cambelt is 72,000 so getting close to number 3 so check when it was last done.
Other than that it's just the normal stuff.....knocking, plumes of smoke that sort of stuff.
Don't assume the mot is a good indication of condition, esp rust on a disco, check for bubbling around pillars/boot/everywhere