I bought my MZG 4WD from Algys, as I live not too far from their depot in Avonmouth.
You need to have patience as I agreed on the Alphard mid April and took delivery 31 August, the DVLA took almost 1 month to send me the registration document!
However it came in under budget thanks to a lower price at the Japaneses auction, so they passed this on to me. I still got a very clean top spec vehicle for about £2500 under a dealer price. It's a bit of a chance buying a Alphard like this, but they have a reputation to maintain, so they can't supply rubbish.
My advice: go for the highest spec and lowest mileage, don't concern yourself about age.
I had a Bongo for 10 years, and I missed the luxury and comfort, the Alphard delivers all this and more.