Hi Loisand,
I know the archway and windmill that you mention, as my great-aunt and -uncle used to live at Packwood Towers, on Windmill Lane. I don't have a photograph of it though; sorry.
I remember that you walked up the main drive, and branched left to come to the brick archway, with the remains of the brick windmill on its right-hand side (it had long since lost its sails, and may even have rather a sawn-off top), and a harness-room on the left. Then you were in a sort of stableyard, with I think a gate leading to a cart track that ran alongside the property to the left - also off Windmill Lane.
Angela