Yup, I brought in a fully loaded Audi A4 Avant 18 months ago and got away without paying for the extra's. However, its all changed now, so when I brought in a fully loaded BMW 320d Touring Sport recently with all the extra's I got stung for everything.
Basically, the VRT people just tap in the chassis number into the BMW (and all others makers) database and they can straight away see every extra the car has and they then tap you for 30% of each extra cost (or 25% if less than 1.9l).
So you no longer get away without paying for the extra's, which you must now factor into the whole 'is it worth it arguement'. That said, I hope to go back over in 6 months and do the same again, just have to bargain hard!