£1500 seems very cheap, be asking yourself why.
Sometimes especially if it’s a private sale they just want rid, but other times there can be a very good reason they want rid.
You can go on the DVLA website and check the MOT history of the car, it can give you some idea of how well a car has been looked after.
Stick your head under the car, look for rust, it’s a 12 year old car now and they are known to rust especially around the rear axle, the “pans” that support the bottoms of the rear springs rust and eventually collapse leaving the car sat on the floor, so it’s quite a serious issue.
Assuming it’s the 1.2 petrol they are pretty strong little engines but just check the service history, no matter how strong an engine is they still need regular servicing.
What colour is the coolant, anything other than a nice clear pink or blue can indicate someone has been mixing the coolant or they’ve not had the coolant changed when they should, there is a pipe on the front of the engine that can corrode and eventually leak.
any mistreatment of the coolant system can lead to problems eventually resulting in head gasket issues.
Good check round the body work l, make sure all the panel gaps look even.
It’s worth doing an HPI check on the car for about £20 just to make sure that there is nothing else to worry about such as past accidents or outstanding finance.
£20 is a small price to pay for peace of mind.