This game shouldn't be designed around the history of England, which was particularly conquest driven. A more accurate in game representation in Civ VII of that country would be would be starting as Celts (Player 1), getting aqueducted by Romans (Player 2), who then collapse/withdraw about 80 turns later, resettled as Germanics (Player 1 or 3), then bulldozed by the Normans (Player 4?) (Normans themselves of Scandinavian origin), then evolving into what we think of as Britain (but also being conquered in 1688 by the Dutch -Player 5- in what totally wasn't a successful invasion... Rule Britannia). Our history is basically a monster fueled multiplayer game of civ.
What was really good news is Dennis Shirk's answer that the AI prefers the historical evolution. Next I would really like to know how cities are passed over (or not) to the new civ at the era change, and how city naming works in particular. "Rome the capital of the Normans" or "Babylon the capital of Kievan Rus" (I'm speculating) is quite jarring. I'm not sure what a good solution to this is. There's a fantastic Civ 6 mod which addresses this, but I'm not sure whether Firaxis would implement something like that.