Identify this classical piece

Can anyone identify this famous piece of classical (opera) music for me please? It starts at 06:00 mins and runs until 07:15.
http://www.bbc.co.uk/iplayer/episode/b01px7lp/Italy_Unpacked_The_Art_of_the_Feast/

many thanks

^bump^ does anyone have a clue as to what it might be?
I'd really like to get hold of the track if it's commercially avaiable though that I doubt