The African Common White - female.
The underside of this sp. is a characteristic yellow, in the female both wings as opposed the male's hind wings only. The female upper-side has a broad black margin which at apices encloses some yellow patches (cf B. aurota where the margin is entire.) The fore wing disco-cellular black marking can vary from a spot (middle picture taken at Cumberland in March) to a well developed bar (bottom picture, taken in the Kruger National Park in July.) Again, in comparison to B. Aurota, the bar does not extend down the costa.
See also Belenois the genus, B creona male
(PS hope my ID correct!)