Assuming the block of wood is a red herring?! It is an old sand pit for the local builders (J G Green being one), probably something to do with manufacturing the concrete blocks from ww11 that are still on the beaches?
Speaking of which, the line of blocks visible now were originally the second line on top of the dunes at Warkworth which were too awkward to remove after the war unlike the first line down on the beach. Erosion has done the rest.
More clues please
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