I will readily confess it's not that easy to make out in a photo (nor on the ground, to be honest) but there is a definite raised area in the middle of this field, which is presumably the site of the original farmhouse, surrounded by a (now dry) moat.
Uploaded to Geograph by Richard Law on 26 June 2010
Photo © Richard Law, 26 June 2010.
Licensed for reuse under this Creative Commons licence