The Citroen Dispatch and the Peugeot Expert and the Fiat Scudo are all essentially the same van, identical size with the same 1.9 diesel engine. Expect very good economy from these vans.
OK so you can't stand up in them - big deal, but for the odd weekend away when most of your time will be spent out of the van - I think they're a good choice.
Attach a tent to the back of it and you've got bags of room. I know of at least one guy who took one of these down to Europe (touring around) simply because of the fantastic fuel economy (just under 60mpg). Plenty big enough in the back to put a bed in and a little camp kitchen.
Your price quoted seems high however given the age of these vans now. I would normally expect to pay well under £1,000 for one with a full MOT and certainly no higher than 100,000 miles on it, mind you having said that these 1.9 diesel engines are usually good for at about 250,000-300,000 miles. The bodywork will clap out well before the engine does. Just make sure you find out what kind of use it had when it was being used as a van by the last owner.