@Jennywren - I think that's all wrong. Remember tax, RFL, doesn't get carried over on change of keeper these days. If you tax based on current V5 reference number, that will change when the registered keeper is updated, and the tax you paid for may get refunded to the current registered keeper, and the van would become untaxed as you take ownership. I'd wait until you pickup at the dealer, or when you get home and tax it after the keeper has been updated online.