What about revenue generated from Waitrose Duchy Organic and other Crown owned but Private enterprises[0]? Not combative but actually curious, but I'd prefer an actual legal opinion on this, not some online commentator to be honest.
To stray back into 'some online commentator' though, I believe that may be outdated: I think it's now wholly Waitrose, just a brand. (Notice there's no Essentials/Cooks Ingredients organic brand/products - if it's organic it's Duchy Organic.)
Interesting. I've also been trying to find if royals other than the now deceased Queen have volunteered to income tax and capital gains tax, but I cannot find clear information on this (which is unsurprisng).
[0] - https://en.wikipedia.org/wiki/Waitrose_Duchy_Organic