Spies, strategies and missed opportunities: How the lessons of 9/11 are still being learnt

No one can question that 9/11 was a colossal intelligence failure, or to be more specific, a failure of imagination in the US intelligence community. At the time both the CIA and the FBI were in possession of information which, if shared properly, could have prevented what happened.

The 9/11 Commission Report that followed blamed "failures of imagination, policy, capabilities and management" on the US government. The CIA and FBI, the report concluded, failed to properly assess intelligence and share information with each other and take sufficient steps to disrupt the plot.

This most basic of lessons has since been largely – although not completely – learnt, and sharing between Western intelligence agencies is infinitely better than it was in 2001. The old rivalries between say, MI5 and Police Counter Terrorism have dissolved, first with regional 'fusion centres' dotted around the UK and now, most recently, with the establishment of the high-security Counter Terrorism Operations Centre in London. Here MI5 intelligence officers might find themselves sitting literally right next to police officers whose job it is to take the executive action to stop a terrorist plot. Equally, they might find themselves sitting next to a US federal agent from the FBI or a language specialist seconded from GCHQ.

Since 9/11, there has also been a root-and-branch reorganisation of US intelligence with the establishment of a National Counter Terrorism Center just outside Washington DC and a Director of National Intelligence to ensure that information is shared where it needs to be between the 18 separate US intelligence agencies. The relationship between the CIA and its UK counterpart, the Secret Intelligence Service (better known as MI6) is perhaps the closest one in the world. This is supplemented by the Five Eyes alliance that pools intelligence between the US, UK, Canada, Australia and New Zealand.

Yet disastrous failures of intelligence, assessment and strategic planning have still occurred since the planes hit the Twin Towers. In the run-up to the US-led invasion of Iraq in 2003, MI6 unwisely allowed its intelligence to be politicised, leading to the organisation suffering its worst reputational setback since the days of betrayal by the double agent Kim Philby and other Soviet moles in the 1950s and 60s.