Louis VIII was chosen by the barons as king of England to replace King John. Unfortunately John died, and Henry III was still a kid, so there was the pull of dynastic loyalty.
Now, I propose as POD. John lives longer (only a year or so, no less than five), causing Louis to be crowned as Louis I in England. Another person with a longer life is Louis' eldest son, Philippe. He died aged eight or so, but let him live to succeed as Philippe III and his younger brother, the personal union being too difficult to maintain with the Channel between and the fractiousness of the English lords, become Louis II of England, Philippe naturally keeping Guyenne and severing the last Continental ties. As he would have been the same man with the same parents and upbringing there is no reason to believe that Louis II would not have been one of England's greatest Kings, and in due course been canonised, maybe even becoming the country's patron saint...