In reply to Alex the Alex:
I couldn't comment on the coolant issue, it's something you need to get checked but I can confirm these are great vans. I run a 250,000 mile d4D 2.5 turbo as my work van and it's never missed a beat. It's had two MOTs in my ownership and passed both with no advisories. I even wish I'd bought the people carrier version for my wife instead of a Previa.
Mine isn't too bad in the snow, bearing in mind it's rear wheel drive. Get some weight in the back and use proper commercial tyres that have a fairly aggressive tread.
I just looked at your profile, I'm in Sheffield, if it can cope with our snow then it'll be fine in Norfolk! Unless of course you're planning to go further afield. Good luck.
Post edited at 17:16