Barbara Cartland was Bob Fenwick's housekeeper from 1829 to 1856, when she was sacked for stealing the family silver which she sold to to fuel her Opium habit.

She later became an opium dealer and had a number of famous clients, including Sherlock Holmes. She supplied him without charge after he solved a little problem she had, as recounted by Dr Watson in "The Wrinkled Lady's Cat"

Dr Watson came around to my house and was puzzled by the sight of a tree full of yellow chickens. I said, "that's a lemon hen tree my dear Watson."

Ouch, that's bad!

The phrase/word/acronym 'OK' (sometimes expressed as "Okay") comes from the Middle English repsonse to local woodchoppers enquiring of the squire "Is it permissible to chop down the stand of trees in the bottom forty?" and subsequently receiving the response, "If it's oak, aye".