WW2 Nissen Huts.

Lincolnshire was known as "Bomber County" during WW2 because of the large number of aerodromes.  All but a few are now abandoned and mostly gone without trace.  Here and there though remnants of runways can be seen, being used as hard standing for the storage of straw bales or, as in this case, Nissen huts are still to be seen on the edge of fields where these aerodromes once existed.