I came across an interesting public Facebook group called Memories of Crowborough/Rotherfield. I had to do a double take when I saw a photograph with comments posted by Robert Pitts on 14th July with a photograph of the elusive No.12.
https://www.facebook.com/groups/520522518060261The house that frustrated so many of us is Rotherhurst House, Rotherhurst Lane, Rotherfield, East Sussex.
It was the residence of the Lyle (Tate and Lyle) family during the 1960’s and 70’s.
According to
https://sussexvillages.co.uk/rotherfield/“The Rother rises here, in the cellar of a house called Rotherhurst where a spring bubbles up and begins a 30 mile journey along the Kent border to join the sea at Rye.”
It was advertised for sale in 1930 in Country Life.
A link to the sale of the property in 2009 is below, so you can see the interior. Sadly it’s now minus it’s tower.
https://shorturl.at/1jugSTrish