Radio New Zealand interview with Kate Grenville on 26th August 2011:
Go to ABC.net.au and search "Grenville" for several interviews, including The Book Show with Ramona Koval about Sarah Thornhill, recorded on 26th August 2011 at the Melbourne Writers' Festival.
There's a short video introduction to Sarah Thornhill at
http://youtu.be/CpHuZsPv1Lg (or search YouTube)
and a short reading from the novel at