I just sold my broken peugeot partner van, 51 reg, 104,000 on the clock for £550 at auction.
It was BROKEN, I didn't clean it and it was still sign written
To be honest I'd have said 1500 - 2000 maybe more, have a look at autotrader van, if nothing else it'll show you that you can't really buy a van for less than a grand if it works