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West Ashling mill was unusual as it was once a combined Steam, Wind and Water mill. The Windmill part was a hollow post mill mounted on the roof. It was built in 1860 and removed in 1955. I took this photo on a visit back in 1989.

Historical note from the property sales particulars:
There is evidence of a mill on the site as early as 1663, but the present mill was erected by Robert Chorley in 1825. A unique mill of its time, as it used both wind and water power, it was geared so that a stationary steam engine outside could drive the millstones when other means failed. In 1832, due to competition and falling demand, Ashling Mill was let for paper making to William Warren, then to Savage Brothers. The water mill then drove two beating engines to pulp rags, and rollers to make course wrapping papers. This was one of only 6 known paper mills in Sussex using water power until steam power drove them out of business. After the 1st World War, when like other local mills, it could no longer compete in flour making with the big Southampton roller mills, Ashling Mill was used for crushing oats and cattle feed. Around 1930 a water turbine set vertically in a corrugated iron housing replaced the old water wheel. The present set of belts and iron shafts to drive the 3 millstones replaced the old pit wheel, wallower and spare wheel, leaving few traces.

https://www.zoopla.co.uk/property-history/west-ashling-mill/down-street/west-ashling/chichester/po18-8ds/23494277