So, the suppliers tested the warmers and couldn't fault them. I got them back yesterday and ran them up...
I could fault them and it seems the problem is in the wee digital box (technical term). It was flicking on and off.... Loose connection?
This would certainly explain the results I was measuring.
Anyhow, I took a short video of the power issues and sent that back to the supplier. They've agreed there's an intermittent fault and are sending me a new warmer.
They've said I can keep the old one so I'll pop it open, re-terminate and keep as a spare.
I guess the moral of the story is to pay close attention to anything that may cause you to have a bad time
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