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Thanks JP
It pays to take note of each process and save a copy after each so you can 'retreat'.
I had to backtrack all the way to step 2 which was noise reduction.
Step 1: DBE Dynamic Background Extraction. All good.
Step 2: MLT Multi Linear Transform (noise reduction).
The artefact (doughnut) was introduced here and was very subtle (I didn't notice).
Step 3: HT Histogram Transform (now non linear).
Stretching the image made the artefact worse.
Then you go onto curves, deconvolution etc etc and the artefact gets worse again.
To find suitable settings for the MLT process (and there are hundreds), I used a small preview and zoomed in.
I could make big donuts, small donuts, donuts with rings, chocolate donuts...
And then SAVE THE PROCESS that works!
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