Well that is actually better than a private sale. Yes you will have pay VAT but there is more comeback if something goes wrong with a dealer. Look with your eyes and pick up any faults. Use these to drive down the price. Then tell the dealer that you want an AA (or similar) inspection undertaken, Say that if you buy it then you will pay the cost however if you don't then he pays. If the dealer has confidence in the van he will be happy with this arrangement if not then walk away. If he agrees to an inspection and you are happy with the outcome then buy it! When negotiating the price, thats when to mention the servicing. If you want the van then tell him. Then beat him down on price. (using the faults that you have already noted). Then mention the servicing If the price is around the price that you are looking to pay then tell him you will have it on condition that it is serviced (including cambelt change!). If the dealer has faith in the van he should be happy to do this. Also don't forget dealer warranty? Make sure some is included (even if only a month) and if you do find any faults after purchase then make sure you get them sorted in the warranty period. Thats what I would do. Hope it helps!