Hi I found a document in this archive when I typed in the name. Try this link.
http://www.national.archsrch.gov.za/sm300cv/smws/sm200gi.
Then click on the RSA repository box, when it opens type in Fisk Ernest and enter. A list of 2 documents will appear, just click on Result Summary.Appears he died in 1955.
The Genealogical Society of South Africa has a "pay to use" service which will enable you to obtain pictures of documents held in the National Archives.
Go to
http://www.eggsa.org and select Content --> On Line Shop --> order Archive documents. Once you have selected the currency, select "Enter the Shop" and then select "Archive photos" (in yellow on the blue band) and follow the instructions.
Much quicker than trying to get the Archives to reply to your e-mail requests!! Good luck Derek.
I typed in Fink first line then Florence second line and enter, result summary had one result which is this, MMK7590/1-989 Griqualand West Board of Executors. 1900 1960.Perhaps some of the other users may be able to tell us what this means??