Could be anyone I guess, but I have thoght since the BPT deal...

Could be anyone I guess, but I have thoght since the BPT deal was announced, that anyone with any thoughts of controlling this company would need to move before BPT were issued their shares, because once they were in I dont think there would be any way to get them out without a ridiculous offer.
Walker immediately springs to mind obviously, unless of course he's prepared to just take a back seat and just go along for the ride. His recent buying though suggests he is actively managing his position.
Then again all just speculation, could even be a couple of traders with a hell of a lot of money looking to do a P&D, but I doubt it considering the volumes beforehand (might be a little hard to get out once they stop buying).