Streptocarpus species, cultivar or hybrid

This pretty, pink-purple flowering Streptocarpus could not be identified specifically. It looks like Streptocarpus roseo-albus without the albus, no white in the corolla-throat.

The twin anthers are white and there is a yellow nectar guide in the shape of the Oros Man ad on the floor of the corolla tube. The flower was seen in February in Kirstenbosch without label, so there is probably an explanation, which unfortunately could not be found.