What if, by some miracle, Harold Godwinson beat both the Vikings and Normans in 1066? Or because both is unlikely, maybe William can't get the pope to legitimize his claim and therefore can't attack without serious trouble from the king of France without the resources of a kingdom to protect him.
Does this Angleland go on to conquer all of Britain and Ireland with more tolerance than the normans did otl? Is europe simply home to a french empire running Lisbon to Denmark (unlikely but France could do terrible things with one good leader devoted to conquest and ten years. Imagine the kings who got caught up in a war with England actually able to expand france) How does colonization differ, if at all?