In reply to EeeByGum:
Haha. Totally agree. Five star camping for me in a bunkhouse is more likely than a tent. Gingerwolf does know me so the comment was more about that really. I'll subject him to some of my not so economic driving when we get out next as payback
The real drive in thinking of a camper was that we are going to Festival Number 6 in September and [my girlfriend] not being the camping sort really (read "at all" although I am looking for a tent for climbing trips) we decided to stay in a hotel and are stumping £240 for three nights. Ouch. It's ever likely that we don't go away so much. So We reckon that a £5000 cheap home conversion would be paid up in 8 to 10 weeks of holiday use. Admittedly it's money that we wouldn't be spending anyway because we wouldn't spend a week in a hotel at that price normally so in terms of how much life costs us it would be a net increase but I would like to be able to go on holiday a bit more than I can afford at the moment and this way one ends up with an asset rather than a hotel bill that isn't worth anything after the stay.
Loving the info guys. Very useful. It seems that diesel is ridiculously better on fuel economy. Keep them coming please and thanks to those who've already put in. If I get enough to make it an interesting table then I'll put it into excel or something such and make a winners and losers results for engine size etc