You know those websites you go to where they ask you fill in just your postcode and house number, then return your exact address? Imagine how they would (or would not) be able to do it if there were that many houses to a postcode. All those numbers 32s!
I am number 122 in my street, the last but two in the street. There are several postcodes for this street alone as with the the other streets in the vicinity.
As Boxtops says, larger businesses and office blocks often have a single postode to themselves, and I believe DVLA has several.
So your business guru maybe isn't such a guru, because he/she's WRONG!!