JoeIt's in most relatively modern English hymnals (e.g. "Songs of Praise" which is a real good''un as it has loads of folk tunes). On the net, the lyrics seem to be mainly on childrens' sites (it is a childrens' hymn). There's a brilliant parody of it called "The Headmaster's Hymn" by Allan Ahlberg.
By the way, what an amazing woman. I'd forgotten that she also wrote Mrs Miniver.