I think the previous poster is referring to the 'margin' VAT scheme, which applies to all CARS passing through (VAT registered) dealers. The situation is different for VANs, and the Cali being a car, but sold by van dealers gets caught up in some unnecessary confusion.
In the simplest terms: The Cali is a car. Private buyers can't avoid the VAT on new ones. When they buy a 2nd one, they should only be shown a single (final) price.
In more detail:
The confusion with Cali's from VW dealers is that they are used to selling panel vans to VAT registered businesses. Van buyers pay the vat to the dealer but can then reclaim it, so they really are only interested in the price without VAT. When that business sells the van, they have to charge VAT.
If a business buys a 2nd hand but 'VAT qualifying' van, the same story applies.
If they buy a non qualifying van, the VAT isn't recoverable.
When a Cali is sold to a PRIVATE INDIVIDUAL, they have to pay the VAT and can't reclaim it.
Because the dealers are used to dealing with businesses, AND BECAUSE THE VW WEBSITE IS BUILT FOR SELLING TO BUSINESSES, (at least it is set up by default like that), Cali's on there sometimes pick up the ''plus VAT" or "VAT Qualifying" flag, often incorrectly.
If a Cali is listed as 'plus VAT' then I'd ring the dealer to see if they've ticked the wrong box when they loaded it onto the website. I suspect they have. The price you see may include VAT.
Oli (who buys Cali's to rent out) will be one of the few here interested in VAT. I suspect he reclaims the VAT on purchase, charges VAT on the rentals, and effectively charges VAT when he sells the vans on. (Even if he advertises them at a flat price, it will include the VAT he must pay on the sale... That VAT may be recoverable to another VAT registered business BUT NOT TO PRIVATE INDIVIDUALS).