The United Kingdom (and more specifically, England) is an exception. Actually, I had the United Kingdom in mind when I've said "most". The system of the government of the United Kingdom is exceptionally complex and in theory it is still ruled by the Sovereign by the Grace of God. In practice though, the Royal Prerogative is exercised by the Crown and not the Sovereign, which means the Government which is lead by the Prime Minister who is in turn the leader of the parliamentary majority which is elected by the people.