"O Mio Babbino Caro" seemed curiously pompous and difficult to engage with. The dramatic brief is all wrong - a girl telling her father that she would prefer to die if she can't go to browse for a wedding ring on the Ponte Vecchio over the river Arno in Florence. Yes, the music is gorgeous, but a Viennese waltz? Tricky. Katie and Anton through by the skin of their teeth.