One point of interest is that indie scholarship success, especially to a prestigious school can be used in appeal for the 11+ as evidence of academic ability. This does of course depend on your region.
This intrigued me Moving as I would have thought that the appeal panel would have opted not to offer a place if they knew a child had a scholarship because they may feel that the child has a good option available and be potentially ignorant in thinking that a scholarship means the child's place will be free too. Obviously this could never be proven but if I were in the appeal panels position then I may do that. I can see that it is more proof of the child's academic ability but I would have thought it would have had the opposite effect. It is a good thing if it does help however.