Seen in a cow pasture up on the Lincolnshire Wolds yesterday
(Above) This poorer photo shows, from a different angle, two 'prongs' which extend from the machinery on top. Do they rotate this pivoted top in the wind? There's a rod extends down to the ground inside... almost like a drilling rig
And these close-up views.... is that maybe an air-raid siren up there? I've no idea what this rusty tower is or was, but it looks like some kind of wartime artefact to me... is it an early wind power generator?