Having splashed out on the Penguin book of Christmas Carols, I've just started doing a daily advent posting of carols on Facebook, using "Singing Together" and "Rhythm and Melody" as sources.
I hadn't recognised it before during discussion, but this tune is used for "What shall we give?" in "Rhythm and Melody" for Autumn 1962

WHAT SHALL WE GIVE?

What shall we give to the child of Our Lady?
What shall we give to the Infant King?
Silk for his baby clothes, down for his pillow;
Tapestries hanging so fair round his bed;
Shoes for his tiny feet, gloves for his fingers;
Jewels and gold to adorn his sweet head.

What shall we give to the child of Our Lady?
What shall we give to the Infant King?
Cloth for a swaddling band, manger to lie on;
Straw for the stable floor under his bed;
Nails for his feet and hands, gallows to die on;
Crown made of thorns for his sorrowful head.

What shall we give to the child of Our Lady?
What shall we give to the Infant King?
Smiles for the baby in stable so lowly;
Tears for his anguish and grief for his pain;
Love for his love that he offers to save us;
Joy in the power that raised him again.