Not a book, but very useful: this website, which appears to be more or less the text of someone’s bachelor’s thesis. (I say “more or less” because it’s rather lacking in citations for its quotes.)
. . . okay, I suppose it’s only useful (let alone interesting) if one might have a need for knowing what the acatry was, where it fit in the hierarchy of Elizabeth’s household, and how many people it employed. (Except that the acatry is one of the few departments for which Batty doesn’t give that last detail. Bad example, I guess.)
In other words, this is a highly tedious website I mention only because it might be of use to anybody else planning to write historical fiction set in Elizabeth’s reign and involving the daily life of her Court.
Which might be precisely none of you. At best, it is very few.