This is a National Trust property but is only open at the weekends in the afternoon an 1 day in the week, so check the website if you are considering visiting. Other NT properties in the area are Hare Hill and Styal Mill.
From the outside looks really small but is actually 4 floors of which you visit 3 of them, with just the basement that you can view but don't go down to.
You get a guided tour and start at the top outside and work your way down. Very informative throughout with demonstrations from the engineer, and you get to view all of the water wheels in action.
Really enjoyed the tour which lasted an hour, which as mentioned wasn't what we expected when we pulled up. Parking directly outside for about 7 cars.
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