Modern vans have almost everything cars have including air con etc. I'd seriously suggest you have a look before dismissing out of hand. I would also check what parts are like for any Jap import. A friend has a Toyota van which wasn't released over here and he's finding some parts have to be imported. There are some nice be sized Toyota and Hyundai (I think) vans around. May be worth a look...What I've noticed about UK spec vans is how basic they are in the cab. If you're driving around then personally I'd want car like cab. If we get one it'll be too replace a family car. So not too big and the options a car normally have. Japanese vans tend to match this closer than UK vans.
BTW I read somewhere that the Japanese version of the UK mot is a lot more severe. Also something about not being able to export out of Japan or into UK a vehicle that's below a certain quality score. Not sure if that's true but I certainly read on a few sites that the Japanese "shaken" test is strict.
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