When you visit Bateman House, remember to get a visitor Map, there are signs pointing to places but with the map in your hand you can find all those nooks and crannies, which are off of the pathway. The house is beauitful and the gardens are exquisite.
However, there is one feature you must not forget to see and that is Park Mill.
The mill is a working mill, and you can buy flour there. And you can go inside the mill and see how the flour is ground. To the rear of the mill, feeding the waterwheel is Mill Pond.
To get to the mill there are a couple of wooden bridges covering the stream, which you have to cross.
Walking through the wildflower garden will lead you these bridges which then takes you to the Mill and Oast Houses. (The shortest route)
Inside Park Mill, you can explore the workings of the mill and take as many pictures as you wish of a working mill. However, please check to make sure the mill is running on the days you intend to go. There is nothing more disappointing than planning your trip, arriving at your destination and find out certain things are closed for the day.
The terrain is a bit uneven in parts so sensible shoes are a must. You can walk further around the estate, exploring the ancient woodland and head to Mill Pond if you follow the map below.