Basically, starting around the late 80s, a bunch of British authors started writing books on British tea-culture that were specifically targeted to American audiences. The best relationship I can think of to this is sort of like the books on Chinese tea-culture that specifically target a Taiwanese audience.
A few clues are that they tend to avoid or ignore any parts of British tea-history that disrupt the aesthetic; you will never see one of these books mention a Teasmade, for instance. Another is Americanized ingredients for tea-snacks, although to some degree this was also a byproduct of when they were written, as postwar Britain went through a process of Americanization that modified many recipes. So similar to the American Bed & Breakfast books, there will be a lot of cream cheese.
Early Jane Pettigrew before she was influenced by James Norwood Pratt and the California gourmands might be a good example, such as her "Jane Pettigrew's Tea-Time" book from 1986.
Other examples I can think of:
The Afternoon Tea Book by Michael Smith (1986)
The London Ritz Book of Afternoon Tea by Helen Simpson (1986)
A Little English Book of Teas by Rosa Mashiter (1989)
I'm sure there are more.
I think they deserve their own subcategory because they are a unique window into American tea-culture at the time, using old British tea culture as the mirror; they are also linked to many of the other American tea-cultures of the time, like the American Bed & Breakfast culture and the Victoria Magazine culture, allowing a person to see how they are all connected.
*Edit:
Another one, A Proper Tea by Joanna Isles (1987)
