I am not too sure about the identity of this fellow as he appears similar to some other raptors found in South Africa. This id was suggested to me by a knowledgable birder so I'll stick to it for now. Canon 40D, 100-400 L IS USM, ISO 640 1/640 6.3
I am no help with the I.D. Stephen but beautiful capture. I really like the forward thrust of the wings and the slight head turn with nice eye contact. Also well framed A round of USM or perhaps curves might make this pop a tad more. Nice timing Stephen and thanks for sharing.
Nice image Stephen! Hope you don't mind I made some edits to your image.
I used a quick mask to select inside the bird. I then created a Brightness/Contrast layer using the Mask. I brightened slightly and reduced Contrast by 25 or so. I boosted the catchlight, sharpened inside the bird using the same Mask created earlier. I used the Smudge tool to get rid of the lines in the upper left.