Merchant VAT Error

Odd that - because although the stuff I buy is nearly always unholey, sometimes it is holey!
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Emmental is pretty much holier than that...
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"What makes Swiss cheese “holey” is additional bacteria called Propionibacterium freudenrichii subspecies shermaniiP. shermanii for short."
I don't think Gruyere should have holes (not sure what your first example is, but I don't think it's Gruyere, looks more like Jarlsberg or similar), and I've never come across one that does (and that's a sample of really quite a lot of Gruyere!). It’s the slightly more rubbery Emmental that has the holes, plus various cheap industrial substitutes.