headless Pi zero + NOIR Picam + Bookworm + motion

In summary, I have upgraded to bookworm.
After much trouble I have finally been able to get images from the NOIR camera but I am at a loss as to how to set the AWB to greyworld.
As a result the images, when lit by IR leds, are very dark blue.
Does any one here know the magic incantation I need to add to the /etc/motion/motion.config file to get the AWB set to show useable images?
i.e. the bookworm equivalent of the old buster parameter of:
mmalcam_control_params -awb greyworld
TIA.
--
Nev
It causes me a great deal of regret and remorse
that so many people are unable to understand what I write.