The role of Egypt, under Mubarak and now post-Hosni, is just one parameter among many others when Jerusalem debates the iranian issue. And this issue is also, as Mr. Benn of course knows, no longer only our problem. Many arabs are deeply concerned about Iran. And let us not forget that we have already seen a number of "preemptive strikes" (stuxnet, explosions, assasinations). The secret war started many years ago, and is not affected by the events in Cairo.
Palestinian youths throw stones at security forces in Shoafat, E. Jerusalem; none injured (Haaretz)
from the article: Mubarak's departure thwarted Israeli strike on Iran