In 1785 Elaine Coffman would have her heroine, Lady Meleri Weatherby, longing to flee to Australia to avoid marrying the son of an English duke, Philip Ashton, to whom she has been betrothed since birth. Who is not a nice person. When First Settlement to that far-flung colony was not even attempted until 1788. And it was not until many, many decades later that the name 'Australia' even came to be used as the name of the country. Near enough is likely not good enough when it comes to historical fact.
Someone is bound to point it out.
A sense of history is important too. Lady Meleri spends much time seeking advice from her maid. She uses her maid as her sounding board. Their relationship is so familiar that the maid questions the sense of many of her mistress's pronouncements for her future. Which does not ring true.