I found the following estate files at the National Archives. Under familysearch, Africa, Natal marriages there is a scan of the marriage of Jeffrey.
DEPOT NAB
SOURCE MSCE
TYPE LEER VOLUME_NO 3/16 SYSTEM 01
REFERENCE H20/1868 PART 1 DESCRIPTION HORSMAN, THOMAS. (S/S RUTH) BORN WATSON. STARTING 1868 ENDING 1868
DEPOT TAB
SOURCE MHG TYPE LEER VOLUME_NO 0
SYSTEM 01 REFERENCE 5300 PART 1
DESCRIPTION MENTON, THOMAS MADDEN STARTING 19040000
ENDING 19040000 REMARKS SURVIVING SPOUSE EMMA MARY (BORN HORSMAN).
DEPOT TAB
SOURCE MHG
TYPE LEER
VOLUME_NO 0
SYSTEM 01
REFERENCE 65805
PART 1
DESCRIPTION JEFFERS, EMMA MARY. (BORN HORSMAN).
STARTING 19280000
ENDING 19280000
REMARKS SURVIVING SPOUSE FRANK JEFFERS. PREDECEASED SPOUSE - MENTON