I think all MAN new van sales are handled by MAN UK not by individual dealers. I dealt with Craig Hackley three years ago and I know he transferred to MAN from his original dealer, he was on 07818 806862. Craig was extremely helpful and the deal resulted in a bespoke new van for our camper build, it may take a while for one like that to be built though but hopefully not as long as ours did at the end of Covid times!
If you deal with him please let me know how you get on.