Les, thanks for your in depth comments. Quite intrigued with your idea of reversing the windmill and can now appreciate the basis for your suggestion. It most, but far from all, societies write from left to right, it may be more natural to visualise movement (of the wind in this case) in that direction also. Mongo tried that but very surprisingly found, that for whatever reason, it was not as effective as the original.
From memory, the background/horizon had a small slope to it as depicted in the image. trying to straighten the windmill also did not seem to accord with the background and the more Mongo looks at the windmill, he is pretty convinced that it was built with a deliberate bias towards the direction of the prevailing winds in that area. In hindsight, that would make some sense as it would give the windmill greater strength and longevity in that particular location.
Agree with not removing some of the foreground. Mongo found that it does make the image lose some context
Very much appreciate your time, effort and experience with your suggestions.
Again, thanks to all for your comments.