The Church is in practice barred from having official positions in political or other matters, since it has no central bodies that could define such stances: nor a spiritual leader (such as an archbishop), nor a central assembly or synod. Bishops have the last say on doctrinal questions within their respective dioceses. The Queen (in practice the Minister of Ecclesiastical Affairs) and Parliament are the central bodies, but they usually keep to administrative matters and abstain from interfering with spiritual questions. Church laws are rarely changed, and, when it happens, only administrative matters are affected.