On the day after the expiration of six months, or such extended period as His Majesty may fix by Order in Council, not being more than twelve months, after the passing of this Act (in this Act referred to as the date of disestablishment), the Church of England, so far as it extends to and exists in Wales and Monmouthshire (in this Act referred to as the Church in Wales), shall cease to be established by law, and, save as by this Act provided, no person shall, after the passing of this Act, be appointed or nominated by His Majesty or any person, by virtue of any existing right of patronage, to any ecclesiastical office in the Church in Wales.