The SAS working on the London Bombings Operation

Were the SAS taken out of the Operation after the death of Menezes? To shoot someone so that the person cannot function after the shot, is a trade mark of the SAS. Was the BMW 4x4 from the SAS? Have they given up their Range Rovers? Were the SAS the ones with the Sniper rifles? Were the SAS brought in again for Fridays Operations?
I think the SAS were back again for the forced entry if required but then to kill - the SAS don't do it any other way, if a suicide terrorist is going to die, then he should die at the hands of the SAS and not through his own choice with a suicide bomb <--- mission not accomplished.
But as we all saw on TV the cs gas was too much for the terrorists - cs gas is used in a test situation to test the function of a respirator (not gas mask), so that anybody who must wear one knows that it is adjusted correctly so that it works in a NBC enviroment. Taking the respirator off in this test enviroment is also part of the procedure and it isn't something anyone can look forward to.
After looking for more infos at google i found this which makes my post look small - here