For once you' re wrong (& I've got you on a minor technicality!) - there was something whacky - ME!
I guess (me aside) the other whacky thing was even with weak pullups enabled ...my ADC pin still functioned.....albeit only down to a reading of 008 (whenever I've set an ADC pin wrong prior...I've had very "something oviously wrong with my config" type results ...this one was more obscure!)
Anyway, apologies for the schoolboy error....
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