No. 1 Warbler ? Lesser Swamp ? 6.11 around Lower Sabie
It is a warbler but not a true warbler like the ones you're thinking of. What I mean by that is that there is a large group of birds which are broadly defined as warblers and this includes all the cisticolas, prinias, camaropteras, eremomelas etc. Your bird is a Tawny-flanked Prinia.
Some more comments that might help you in future; Many of these non-descript LBJ's have quite distinct calls and the Tawny-flanked Prinia is no exception. This guy is giving best (but pictures don't capture the sound of the bird do they
). You may want to start familiarising yourself with the calls of these birds which would make it much easier for you to identify them. The Lesser Swamp-Warbler also has a distinctive call.
Warblers are usually very habitat specific which also helps when trying to identify them. Just as you wouldn't find an Icterine Warbler on a braai grid, you won't really find a Lesser Swamp-Warbler anywhere other than in reeds and waterside vegetation - certainly not in a tree like the bird in your picture.
No. 2 Lesser Grey Shrike ? 11.11 around Crocodile Bridge
Are you sure both of these birds are the same? The first one certainly is a Lesser Grey Shrike but the second one looks more like a Red-backed Shrike to me. The slighter bill, pinkish wash to the underparts and black tip to the under tail suggests Red-backed Shrike.
No. 3 Senegal Lapwing ? (Lesser Black-winged Plover?) 14.11 around Biyamiti
Quite right, the lack of a red orbital ring, smaller white patch on the forehead and the narrow black margin to the grey bib separates it from Black-winged Lapwing. Nice bird.
No. 4 Sandpipper ? 15.11 around Berg-en-Dale
Not a sandpiper but a beautiful pair of Greater Painted-Snipe. Very special birds indeed and not readily seen. As a matter of interest, the Painted-Snipe shows a sort of role reversal when it comes to the sexes as compared to most other birds. The more boldly coloured bird (the one on the left) is the female while the more drab looking bird is the male. The males are also the ones that incubate the eggs and, unlike so many other species in the animal kingdom they are actually polyandrous - meaning that one female will breed with 2 to 4 males. Beautiful picture of two very nice birds!