Marian Krogh Nel from Zwavelpoort:
Referring to Greville Sheard’s request in The Bronberger’s June edition about the people in the photos at the unveiling of the Pretorius gravestone at Pelindaba, the following:

I do not know who the lady with the white hat is, but in the photo next to it the lady is Hannie Preller, nee Pretorius, the wife of Gustav Preller. The gentleman is unknown.

Hannie Preller, nee Pretorius, the wife of Gustav Preller, with an unknown gentleman

In the group photo, from left to right: Unknown; AW Krogh, néé Pretorius (my grandmother); JM van Straaten, néé Krogh (aunt); Hannie Preller, néé Pretorius, sister of AW Krogh; DL Krogh and HP Krogh, sons of AW Krogh and my dad’s brothers; unknown gentleman; Saar Carter, néé Pretorius, sister of AW Krogh; and Hannie Preller. The tall gent is William Carter, her son.

Marian refers to this group photo that Greville sent

I do not know the next group of people, but the last three are Robert Preller with, I assume, his wife Lyndsay, with the last gent most probably being Bob Preller’s brother Tol (CF Preller).

Hope it helps.