I love this hymn! Isn’t the music by Ralph Vaughn Williams? It’s appropriately majestic with full organ accompaniment!
Vaughn Williams really was the perfect composer for the English Hymnal. So much of his music (including this tune) is based on traditional English folk song, so it's organically English and fits the rhythm of English speech to a "T". His 4 part setting of the "Magnificat" with the old Prayer Book words is perfection.