The main link above and the once more added link below indicates the reports from South Africa. The Vestal is almost a "global" moth.
http://www.africanmoths.com/pages/GEOMETRIDAE/STERRHINAE/rhodometra%20sacraria.html
Geometridae, Sterrhinae, Rhodometra sacraria.
http://ukmoths.org.uk/show.php?id=6173
http://en.m.wikipedia.org/wiki/Rhodometra_sacraria
The typical pose and the veins and spot let me think of Rhodometra sacraria rather then this one:
http://www.africanmoths.com/pages/GEOMETRIDAE/STERRHINAE/pseudosterrha%20paulula.html
That one would have the end of the stripe not at the apex of the wing but slightly laterally at the apex.
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