Mary’s parish were going to sing this song by Kevin Mayhew.
I hadn’t heard it before so I had a listen and it didn’t thrill me but he did go on to create a huge publishing empire so what do I know.
The text is here. It is available in a collection at Kevin Mayhew of all places where you can also hear a version of the whole song.
My backing is a bit of a fail (it isn’t very peaceful):