Ok - I just found the article at:
http://tinyurl.com/zvgsw
The Daily Mail claims that Blair knew about the attacks, "before the guerilla group kidnapped two Israeli soldiers," and that these claims, "are made in today's edition of the New Statesman." My reading of the New Statesman article doesn't agree with this.
The point about the intention to attack Iran comes from Dr John Pike who runs globalsecurity.org. The Daily Mail says that he "believes" there to be "an agreement between Israel and the U.S." with regard to attacks on Iran. It suggests that Israel has been waiting for an excuse to attack Hezbollah.
So, fair play
matt66, I still believe that joint US/Israeli attacks on Iran are far fetched, but I certainly don't know as much about the Middle East situation as Dr Pike. I don't, however, regard the Daily Mail as a reliable reporter of news and my cursory searches on globalsecurity.org haven't turned up any quotes of Dr Pike that match the Daily Mail's report. It's certainly not clear enough to treat it as fact.