In reply to iksander:
I've recently bought a Renault Master minibus (same as Vauxhall Movano) MWB high top and finally converted it into a camper. Unfaultable really. It came insulated, boarded, carpetted, roof vent and windows, and lighting. Admittedly, the wheelchair lift was superfluous, and I sold it on Ebay for £100. The van cost me £1,300. 133,000 miles on the clock, all gentle miles (ferrying disbaled children around), looked after and good bodywork. If you can find anything like that, I can heartily recommend a Renault Master minibus. And 33mpg fully loaded too!