WW2 Bombing arrow at Mawbray

A WW2 concrete bombing arrow in the sand dunes on Mawbray Bank on the Solway Coast AONB of Cumbria.
This bombing range was built for use by the No:1 Operational Training Unit based at Silloth. They would fly down the coast, line up with the arrows and bomb targets out at sea.
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There is another smaller arrow close by.