Images of England showcasing windmills

The Images Of England site which provides the Listed Building details of all the listed buildings in England (and aims to add a photograph of each thanks to volunteer photographers) has put together a page that showcases windmills. Their text contains a rather glaring typo - they claim over 6000 windmills are listed, whereas the number is really 600. The article has 4 photos with it, but there are a number more to be found in the rest of the site (though unfortunately they are far from their target of having all buildings illustrated).