UPDATE: I went to view the car & it was quite nice, it was very clean inside with not much wear on the seats etc which i thought was good considering the mileage it's done.
The engine sounded quiet on start up & apart from it pulling slightlyto the right (tyre looked a bit under inflated) it drove really nice.
When we got back off the test drive the engine sounded a bit 'tinny' like the kind of metallic noise you get if a manifolds blowing but it wasnt coming from the exhaust area. The trader said they all sound like that & this was actually rather quiet compared to others.

So - people in the know, do they all sound like that?