Ok, wow! Yes, according to the link for Sandy Hollow in the first paragraph in this Wiki article about Duke Tritton it is in the Hunter Valley. We have so many place names in this area which are named after places* in the UK and Ireland that I just automatically assumed that was the case for Sandy Hollow.

* Off topic, I know - but place names including Aberdeen, Aberdare, Cardiff, Swansea, St Albans, Gateshead, Hexham, Wickham etc. BTW, many of the place names are associated with coal mining areas because miners came out here to Oz to work the mines.