The two-hour-long, early evening installation ceremony was a significant one for the church, since a pope is pontiff because he is elected bishop of Rome, andnotviceversa.
Mr Cameron denied his campaign to solve the so-called "West Lothian" question - where Scottish MPs can vote on issues which affect only England like health, law and order and education but notviceversa - was pandering to a "little Englander" agenda.