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Well friends, given the confusion that the photos caused in these circles, I no longer feel so forlorn at having blotted my copybook so badly. I would hardly have believed that I could have confused Tabanidae with Bombyliidae so easily. And when Hesse said "females ... have a marked resemblance to some tabanids and are more often seen on flowers of composites", that consoled me greatly! So thanks a lot Steve! :)

Incidentally, the Composite (Asteraceae nowadays of course) is a Gazania, but I don't know which species.

And thanks to all of you for your generosity and patience!