Jonathan Strange and Mr Norrell

[Catlady (Rita Prince Winston)]

I recently got around to reading JONATHAN STRANGE AND MR NORRELL. I enjoyed it. If JS&MR spoilers are allowed on this list, I would like to discuss the alternate history in which it is set. As a clueless nerd with no sense of humor, I find it unlikely that a history which diverged from RL history during the reign of King Henry I of England would lead to exactly the same Britain, America, France, King George III, Prince Regent, and Napoleon I that RL had. Specifically, even with my ignorance of English history, it seems to me that it would have messed up Carol's Wars of the Roses. Such as, would there be a House of Lancaster if the city of Lancaster had been burnt to bare ground in 1110?