I think someone's being pedantic, aren't they?
Granted I'm unlikely to work my way through the entire fleet, but when the van breaks down (quite regular) or goes in for a service (less regular) I don't know which vehicle I may get to replace it out of probably 500+ locally.
When out working as part of a team there can be up to 10 assorted vehicles from various places, any one of which I may need to drive. If there's an emergency somewhere remote or flooded (or just needs a genset towed to) I may need to ditch the van and collect the nearest 4x4, again NFI which one of the many that will be. If we need a cherry picker for access I might have to go and get one, then there's the 7.5 tonner emergency exchange on wheels, cable jointing wagons...
My point is I can reasonably expect to require the use of a hell of a lot of vehicles, especially when the manure hits the rotary ventialtion apparatus, and not easily identify which ones they may be at any given point in time, certainly not with enough notice to apply for a new licence card to drive it!
What about emergency services, they need to be able to drive any vehicle they find, whether it's stuffed into a hedge, broken down in the fast lane or whatever. Not just talking police/fire/ambulance but what about the AA blokes? Then there's people who work in garages or even kwik-fit for that matter.