Righty-ho, time to report back on the Honeyguide. I've spent most of last night beating myself up about this bird and here's what I learned, from consulting numerous field guides, websites and more experienced birders.
First of all, this bird in the picture is a Scaly-throated Honeyguide, no doubt about it. The more I looked at the picture afterwards the less convinced I were of the Lesser Honeyguide ID up the point later where I couldn't believe that I had even considered Lesser Honeyguide. Well done Moegaai for sticking to your guns on this one.
One or two comments on juvenile Lesser Honeyguide features. The sometimes do show mottling to the undersides but rarely streaking and more often than not no visible markings at all. Roberts VII says, amongst many other things, the following "Juv: Darker below than ad; throat streaked, breast buffier and flanks less streaked." but just about every other reference I could find makes no mention of a streaked throat and I could not find any picture showing such a feature either.
As for the habitat preference of Scaly-throated Honeyguide I'm getting conflicting information. The general sentiment seems to be that they are indeed forest birds and are much more regularly recorded in forests but a number of good birders have told me that they have recorded Scaly-feathered Honeyguide in riparian woodland such as that which can be found around Skukuza.
As for recording SCHG in bushveld it seems the general agreement is that this is not the type of bushveld that we are used to in places like Kruger or north of Pretoria but rather Eastern Cape valley bushveld, an ecotype that I am not really familiar with.
Another dominant opinion seems to be that they are more common along forest edges where ecotypes meet rather than deep inside forests, but mostly where a forest is nearby at least.
At any rate, this certainly put the Scaly-throated Honeyguide in better perspective to me as it is clear that I did not really understand the bird like I thought I did. Either way, I still think finding and photographing a Scaly-throated Honeyguide near Skukuza is highly unusual and to be commended. Nice one borrodcor2