Colin,
It certainly looks like Mirafra. Save possible accidentals from the genus, the only one I have ranging there is Mirafra cantillans simplex. I have gone into my database and compared them with my pics for the species, but I only have pics of the nominate subspecies which differs in having the primaries of a slightly more rufous color. Comparing the two, other than this, though I wish I had a frontal shot showing the chin and breast-streaking, they appear to be identical in every parameter that I can analyse, head marking, beak, leg color, marginal webbing of the feathers, belly color and so forth. So, I would say that you are right!!