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@adrian04
This is now resolved, and rather embarrassingly it WAS a dodgy device, in spite of me supposedly checking everything! I did some direction finding with a world band portable radio tuned to 7.150, and went round the house and garden again.
What had been puzzling me was that the suspected culprit - a smart socket - didn't seem to be making a difference but the noise was still present when I switched it off completely.
I'd completely overlooked a cheap Chinese lithium battery charger, it was hidden away in a cupboard powered up (originally kept in there as the blue LED display was rather bright at night time).
Normal service is resumed as they say (and some important lessons learned). Amazing how much spurious RF such a small device can scatter such a distance!.