There is no doubt that the ENO are making a grand gesture with this Sweeney Todd. It is to herald a new return to musical theatre as a key aspect of their repertoire; it is, significantly, a transatlantic production which points to a strong artistic friendship with Broadway; and they have certainly gone all out on the luxury casting. Bryn Terfel draws the opera faithful, while Emma Thompson endows the stage with Hollywood glamour. And whether you count yourself in Team Terfel, Team Thompson or both, the two leads give fabulous performances which linger in the memory. Lonny Price’s production is also tense and grisly enough to make it wise to eat beforehand…