ZOMG extortionate,
but it all depends what was done,
major service I assume would possibly run 250-300 on its own, add in a few wear and tear components and it could be easily 800 quid
I mean if you were to add a set of decent tyres on there maybe half and exhaust and a few odds and sods you wouldn't be far off but I would assume a 05 plate van would still be under warranty(3 years ) or is it an import (reduced warranty) I mean theres some pretty pricey things can go wrong with modern vehicles that might not seem much but can be pricey to rectify.
So ideally can you let us know exactly what work was carried out if it was JUST a service i'd be hitting someone but without knowing that cant say