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Monticola rupestris
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Male : http://www.projectnoah.org/spottings/139...
Female : http://www.projectnoah.org/spottings/140...
I am not very learned when it comes to African birds. It is a female Rock Thrush, you may be right with Sentinel. I suggested Cape Rock Thrush because it's a more common species. I can't distinguish the two species well enough to definitely say either way.
Liam, I have a pic of Cape Rock Thrush. This one does not look like one. may be Sentinel Rock Thrush.
I'm thinking a female Cape Rock Thrush, Monticola rupestris: http://www.birdforum.net/opus/Cape_Rock-...