and (more or less) solved the problem. In short make sure your power supply AND your micro-USB cable are high grade and make sure your room is not lit by flu-tube lights.
I had fitted an extension USB cable to the too-short one my Pi came with and that was the problem.
I changed out my USB cable for a thicker one, turned off flu-tube light (just use a non-flourescent light) and everything looks a LOT better, not perfect - but far better. I expect that in natural light it would be fine - but at present it's dark here.....
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