Barry,
I will try to let you have an answer to your question in the next few weeks.
A colleague recently used the very latest German radar kit (30 grad setup)
to survey a small area in Combe Martin on my behalf. The scan certainly
seems to indicate the presence of a mine shaft. We will be excavating this
anomaly over the next few weeks, so I will let you know just how accurate,
or otherwise the scan was.
Kindest regards,
Trevor
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