Black Sheep (by Georgette Heyer)

I re-read my collection of historical novels by Georgette Heyer regularly; they’re my comfort reading, but I try to limit them to one a month. I last read ‘Black Sheep’ in 2019 but - as ever - had forgotten most of the details of the story, even though I recalled, vaguely, the main outline of the plot. 
Abby is the main character in this. She’s twenty-eight, and a strong-minded, practical young woman with a good sense of humour. She sometimes rails against the rules imposed on society in the R...