It would appear PP has already been granted for 3 of the 10 houses, to be built where the stable block currently stands (the "L" shaped building on chriskay's link). Which is a shame, when on a local horsey forum there are a number of posts from people wanting (and struggling to find) stabling with a bit of land to either rent or buy. It'd be perfect for anyone with horses too, with the nearby permissive access through Storeton Woods.
Actually, as I read it, planning permission has been granted for the conversion of the stable block into three dwellings. This new application would supercede that permission. A main difference is that conversion of the stable block (without much alteration to the exterior) is on a completely scale from the new proposal.
Although I have no interest in horses, your point about that aspect is a good one, and the permissive bridle path through the woods is a good alternative to riding along Mount Rd.
Anyway, although I don't hold out much hope, I hope the application gets thrown out.