Another of the collections that the Praise to God parish hymnbook used was Father James Quinn‘s, New Hymns for New Seasons, from 1969. These were new hymn texts often set to old tunes. While that collection is out of print, you can still get this song in his best of collection, Hymns for All Seasons.
This one is his version of the Magnificat set to EDWIN by Edgar M. Deale, who lived from 1902 to 1999, so I suppose his music was actually current in 1969. The text is in this preview, but note that this has a different setting by Paul Inwood.
It was time for the wind up BIAB fake organ: