[/quote] As for paint, just a carefull look all over, not sure if there's a common fault, front roof line above windscreen used to be a problem i believe, but it's so easily marked, just spend 10 minutes checking it all over. [/quote]
Spend an hour with a cup of tea checking it over. Once you have signed for it, it is much harder to get things sorted.
Most of the problems have been hairs and grit under the paint and /or laquer.
Sometimes there are 'shadows' which look like dark patches. They stand out in shade but in the sun the glare from silver hides them somewhat. I have two of these patches on each "A pillar" either side of the windscreen.
Just take your time. You won't want to start finding faults the first or second time you wash your pride and joy.....!