Clayton Windmills, known locally as Jack and Jill, stand on the South Downs above the village of Clayton, West Sussex. They comprise a post mill and a tower mill, and the roundhouse of a former post mill. All three are Grade II* listed buildings.
Jill Windmill, built in 1821 in Brighton and moved to its present site in 1852 is open to the public most Sundays whilst Jack Windmill, built in 1866, is privately owned,
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