Your books are extraordinarily accurate in detail. To be that accurate you must prize accuracy and pursue it diligently therefore I thought I'd draw your attention to a VERY trivial sort-of-mistake.
It turns out chairs were quite rare in the medieval world, much rarer than people think. You are probably okay in "Fools and Mortals" but you'd be surprised how many inventories of wealthy households in William and Mary's era had exactly one chair per household. And of course books set prior to that people stood or sat on stools or benches.
I don't particularly expect you to believe me - I'm just an ex-furniture builder and a bit of a museum hound. You may want to ask a curator next time you're at the V&A or any other good museum for more details.
Anyway, I think I've read everything you ever wrote, even buying Fools and Mortals in pre-release. You have afforded me - and several million other people - much enjoyment and for that I thank you.