Hello Louise Thank you for your Message I have been searching too for some time now and to date I still have very little on Tunstall Family history. Your mentioning New Castle is really great as I now have something greater to look at.
Sorry I must have given the impreesion that I was in Australia I am In New Zealand however did have an Uncle in Australia.
My search has been differcult due to the lack of information New Castle is the place given for my fathers Birth place on my birth certificate.
You may like to scroll down and look at my earlier posting