This is the endgame. This element of the 22nd Special Air Services Regiment are tasked with actually closing in and either capturing bin Laden or assassinating him and Al Zawahiri. Bush and Blair have agreed that the SAS are the guys to actually do the takedown. My suspicion is that several SAS "sticks" have been on the ground in the Northwestern Frontier States to recce and try to pick up bin Laden's trail.
The SAS are the best in the world. At any one time, there are only a few hundred men in the entire regiment. Look at it this way. The Pentagon let leak, quite loudly I might add, that a Spring Offensive was in the offing in the Border Region. So bin Laden's people as well as his eyes and ears in Bagram, Kabul, Islamabad, Baghdad, and other spots, have kept their eyes on the movements of American military units, paying special attention to landings by paratroopers, Rangers, Air Assault units, or Mountain Division troops.
I bet they forgot all about the SAS. The SAS didn't forget about them, however.
Be Seeing You,
Chris