If you are happy with how a car looks on the outside, take a look at the inside too before you make up your mind.
We're not just talking about cigarette smoke or pet smells. More seriously, a musty or mouldy smell could indicate water leaks. So if it does smell damp, make sure you have a feel of the carpets, lift up floor mats and check rubbers for mould. If there is a strong smell of ash or dogs it may be worth noting for when you talk money.
Firstly, check all the seats and sit on them all, even if you don't intend to use the back seats. The driver's seat may be more worn, but there certainly shouldn't be any sagging or rips. Try all the seat adjustments to make sure you can get into a comfortable driving position. You should also check the condition of the steering wheel, gear stick, pedal rubbers and instrument panel.
In the boot you should check for signs of water and pull back the floor covering. Push down on the floor and listen for crunching from the edge joins. Examine the spare wheel to make sure the tyre is inflated and that you have everything to change a wheel (jack, handle and wheel nut spanner – in case you weren't sure!). Also check the door handles and locks, the sunroof and alarm system.