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The text says "only five sails". Windmills normally have four sails. Logically, it is easier to construct a pair of beams crossing at right-angles, hence four sails.
However, about twelve and a half miles away, at the town of Heckington, there is an eight-sailed windmill. As to the tallest, at Stalham in Norfolk there is a mill which is seven storeys high. I do not know if it is still grinding away, but it is certainly taller.