This Saturday, go to London’s oldest Catholic church, St Etheldreda’s in Ely Place, Holborn, and you will find a gathering of singers, along with actors, announcers and other public speakers, who have come to have their throats blessed. Two crossed candles are held up by the priest and either these or a piece of wick soaked in holy oil are touched to each kneeling suppliant, as a special prayer is said.