The secret meeting to elect the leader of the world's Catholics is set to begin, bringing with it the intrigue of an ancient system of anonymous voting in Vatican City.All eyes will be on the colour of the smoke emerging from the chimney of the Sistine Chapel.

The secret meeting to elect the leader of the world's Catholics is set to begin, bringing with it the intrigue of an ancient system of anonymous voting in Vatican City.All eyes will be on the colour of the smoke emerging from the chimney of the Sistine Chapel.