It is the Ndebele tail scheme, but the reason you might have not seen it is because there are two different types of South African color schemes (Ndebele Martha and Ndebele Emmly) I think the one that '22886' has shown is Ndebele Emmly.
Hope this helps,
P.S BA is not painting aircraft in any new world livery tails anymore.
I like British Airways! I'm not sure why, but I do! ;-)