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Hi Bruce,
It was the User_setup.h that I had forgotten to check. It had changed.
All 3 stm32F103's work and no problems. Thought I had a forth one but that turned out to be a stm32F104 Blackpill

Have some more stm32F103's coming from China
Have found a small problem with some of the NEO-M8N GPS units, they are marked as M8N but when checked with ublox u-center they are M8L's
To start with they wouldn't work in the clock but found that if you do a revert config and then transfer them to the clock they work ok.