Thanks for your interest in this anomaly and I have found your suggestions very helpful. I have today entered a semi-rural address nearby and, as you have suggested, it is more accurate and only showed a discrepancy of 50 yards.
When I have the opportunity to next go into an urban area I will check the accuracy then. I am sure you have found the answer to this curious problem.
It is odd that my really cheapy old Garmin I formerly used was always spot on accurate all over Europe.
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