The active mini-whip coax is grounded at the antenna end via a ground-spike and via it's power adapter to the common in-house dedicated earth.
Also, I must confess that on further checking there seems to be little CONSISTENT difference in signal quality between the two power supplies, but the use of a nearby television does have a very noticeable, but variable effect, which has confused the issue.
Interestingly perhaps, this came as a surprise because this same device had previously caused no problems.
My apologies for probably wasting your time, but thanks for your interest and advice nonetheless.
Useful information regarding antennas for SDR products.
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