It's a very big property. Just been looking at the aerial map Geoff posted and it's the biggest in the area as far as I can tell. Very surprised that it's as late as the 1870's. Actually, I have no idea why I thought it was older, maybe because it's crumbling and very dirty. It's got new chimneys

Google Maps places Eastgate House next door so I may have been wrong in calling The Quarry that yesterday. I do know that a few years ago it was in use as a residential home for people with serious mental problems so I assumed the two were the same... Maybe they are?
Here's a social services review of the home in 2009 if anyone's interested?
http://62.73.173.233/CSCI/CRH/11/ES0000002611.V2000052982.R01.S.pdfAnyway, this is the site of The Quarry on the map