If you all want to sleep in the van (if you go for a VW) you'll need a Viking or Super-Viking (4 in the top, two underneath). Have a look on The Early Bay or The Late Bay websites, there might be some helpful advice on there.
It's a great community - and the VWs are lovely. There are 6 of us and we have a Viking - its a pile of filler and rust and the moment but we love it.
Anyone had any experience? My kids are desperate to us to buy one (which no way can we afford) but we might be able to hire one for a week in the summer. We just want to stay in the UK and visit the north of England and maybe Scotland. Any recommendations of hire places (it's for two adults and four children) or tips on campervan holidays. A VW van would be awesome but any kind of van would be exciting for them.