This is something I've always found quite fascinating due to my research on A et D and my general love of the era. So from the first break in 1533 to the end of James II's reign in 1688 there were numerous plans, ideas, conspiracies and hopes by Catholics at in the British Isles and on the continent that England would somehow, someway be returned to the true faith. Many of these ideas were pure fantasy, like James II's idea that once the penal laws were repealed the English would convert in mass, while others, like Henrietta Maria's efforts to convert the country's elite, could have conceivablely bore fruit. My question is this: what is the realistic latest date that England could be "re-Catolicized"?