Thanks for your observations Brian. I would be interested to see if you can find more details next month.
Apologies guys - title changed
Very nice castle
According to Christchurch Local History Society: Mentioned in the Domesday Survey of 1086 valued at 30s a year, being the property of the Canons of Holy Trinity Church, Place Mill has medieval stonework and Tudor and 18th Century brickwork and was used for both fulling and corn grinding until 1908.