I believe that you and I are 4th cousins or thereabouts. I live in Devon, England, and am in the process of investigating the family history. So far I have a fair bit of proven information on our branch of the Dickers back to the mid 1700s.
There are two other cousins in the Sydney area, (not Dickers) that I can put you in touch with. One of whom has a fairly complete family tree. It is he that has provided me with info linking you with our branch of the family.