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Oliver Schick-
... I realised this and edited, but still didn't fully answer your question.
It's on the north Cornish coast near Morwenstow. There is another interesting hut along that footpath, a hangout for the poet Robert Stephen Hawker.
miro_o
Fremantle House. The area around the Dover St estate is just interesting.
{edit} ... oh ... you mean the thing above? I think it's either an abandoned observation post for customs or airforce training. There were many airfields close-by.{edit}