This blog allows me to learn new hymns that other parishes are using and this is one from Chris’s parish by Ruth Duck.
The text is all kinds of wonderful (here) and the old tune Beach Spring is the same as “God of Day and God of Darkness” so nothing new to learn if you know that one.
It is 481 in Gather Australia and while I couldn’t find a purchase for download Hymnary lists the many hymnals it graces.