Is it for sale in a dealers or privately ? How much MOT does it have, if less than 6 months why not spend £45 on an MOT, whether you buy it or not thats not a bad deal for an independent but limited inspection ?
Did it have any advisories on last 3 MOT`s and can you track the service history to see they all got fixed ? Is it FSH and does it look genuine ? Is it HPI`d ?
If its a dealer do they have a good reputation, check their ebay score and any independent reviews on the net, particularly Autotrader. Can you contact the previous owner off the V5 - that is usually the single biggest factor in making yourself feel comfortable or uncomfortable depending on what they say and how they say it ?r