Keegan's final paragraphs in The Telegraph from We should be very worried about Iran.
For if the West is considering military action, so are the ayatollahs. They are the sponsors of much of the insurgency in Iraq and suppliers of the insurgents' weapons. They also have intimate links with most of the world's worst terrorist organisations, including al-Qa'eda and Hezbollah. Iranians may well be the missing link for which MI5 is searching behind the July 7 bombings in London.
Moreover, while Iran has its own armoury of medium-range missiles suitable for nuclear delivery, the ayatollahs are also known to favour the placing of nuclear warheads in target cities by terrorists travelling by car or public transport. This is a bad and worrying time in world affairs.