As it is an Approved Used car, make sure it comes with all the right bits. They are often missing mats, the bottle opener and USB and iphone media leads. Without them, the car is not complete, which it should be if it's being sold as 'Approved Used'.
When I went to collect my Golf, it had no mats in it. They told me it was a used car and the previous owner had taken them out, so that was that. I told them that they should be there and the car was not complete without them. They could tell I wasn't going to be fobbed off, so went and got me a set from parts.