The Synod needed a two-thirds majority to allow the ordination of women as bishops in the Church of England. The Synod has 467 members divided into three houses. Each of the three Houses – bishops, other clergy, and laity, needed to agree by 2 to 1 that women can be bishops.
Given that for twenty years women have been ordained priests of the Church of England, you might ask what the special issue is about bishops? The answer is, if you’re flatly of the belief that God just doesn’t approve of women becoming priests, then you can easily avoid a woman priest. (Well, more or less.) But bishops ordain priests. If you believe God holds women inferior and unable to be priests, then it follows that women can’t be bishops: that priests ordained by a bishop who’s a woman aren’t proper priests. But as those priests will be both women and men, you won’t know for sure if the priest with whom you are dealing is a real priest, validly ordained by a man, or invalidly ordained by a woman.