[The Philpott]

No solar panels close by, as all gable-ends are north-south aligned in this road.
Not vehicular interference as it was on the test bench.
I will try it at different times to see if it's an appliance that's in intermittent use.

Thinking about it the car radio i have in use has MW and LW ranges, so it might be a case of driving around Gestapo style to see how localised the effect is.

I might even have to enlist Guy's help to triangulate it next time he's in the area!..

Thanks for your suggestions.

Dave