With older vehicles its all about condition, are the tyres a ake you heard of , does the car smell, drive it yourself over familair roads. Check for spare whell jack + tools under the boot lip carpet.
There are 000's out there however since covid used Jazz auto's have become a strong seller .
Pop the reg number into confused.com.
Buying privately you can gently push the seller once you have check MOT History & HPi Experian checked for loans cat S N etc
Good Luck