Hi Judy,
What is your connection to William Tree / Elizabeth Ashdown and Griffess Tree/Elizabeth King? Iam through Lois daughter of GT/EK
I have confirmed the 1Jul1833 marriage of Griffess Tree/Elizabeth King from the parish church records of Rye, Sussex (LDS film-1067289). The record does not give much further details except "both of this parish" and they were "batchlor/Spinster". Both signed their names. Witnesses all signed: Daniel Tree, Maria King, Martha King, Mary Tree.
A search of Rye parish records indicates this is the place of the Kings but not the Trees.
The only reference of Elizabeth Ashdown like you was on the Aust. death cert of Griffess Tree in 1870. Informant was his daughter.
I have also found the web info on WT/EA marriage in Woodchurch, Kent but it has no baptisms for Tree or Ashdown so not sure where to go next with this.
Regards,Tim