I think the original poster was saying that he seldom read the attribution, not that it isn't there.

Hey Shanty, that's my current obsession too! For the life of me can't find the text of the song it is drawn from.

You already posted the link I tried to with that blasted blue clicky.

The music of several of our hymns is folk, British Isles, Spain, Scandinavia...

The music to four hymns are attributed to Ralph Vaughn Williams.

If anyone is interested, the facsimile of Emma's Hymnbook I bought in a bookshop near the Preston Temple.