It doesn't really take the brains of an Archbishop to work out that the SAS are going in. A less than fertile imagination might guess that they are already there and there has been enough written in the press/books since the Gulf War about how they operate. The key point for secrecy would relate to a particular OP or area of operations. I doubt many people in the MoD could tell you where they were at any one time. Speculate away it helps spread confusion - they are good enough to look after themselves. Good luck