What would the results of a surviving Lady Jane Grey-Guildford Dudley be? Mary I only put them to death as part of a condition of Philip II coming to England to marry her. (Ironically, her mother coming to England had been preconditioned on the execution of the earl of Warwick, another claimant to the throne, as well.) If Mary and Elizabeth were to still die childless, Jane would be the next in line to the throne (according to Henry's will) (those females with Tudor blood seemed to be a relatively long-lived bunch if they survived infancy (dying at fifty/sixty, if they didn't die in childbed before that), however she won't live long and will presumably be succeeded by one of her kids in due course.
How might this affect the world/English stage?