The Eastlake's I am related to come from Tavistock, Devon, and some of them did go to Australia and I believe still live there. My auntie is researching the family tree so I shall pass on your e-mail address to her, I hope you don't mind, and I am sure she will contact you if she feels we could originate from the same place!
How long have you been researching your Eastlake family tree? Celia has been doing it for 20 years or more and has gone a fair way back.
Cheers again Eastlaker.