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4.3  |  Iraq WMD assessments, October 2002 to March 2003
659.  In response to a question about the extent to which SIS had been obliged to rely
on sources who were not WMD experts and the implications of that position, SIS4
confirmed SIS did not generally have agents with first-hand, inside knowledge of Iraq’s
nuclear, chemical, biological or ballistic missile programmes.273
660.  Sir David Omand told the Inquiry:
“I think there were certainly people in the intelligence community, and there are still
some, who believe that something will turn up in Syria, and I am certainly not going
to break my own rules and say categorically that won’t happen. We could all still be
surprised. But there was a sense in which, because of past successes – very, very
considerable successes supporting this Government, that SIS overpromised and
underdelivered, and when that became clear that the intelligence was very hard to
find … they really were having to bust a gut to generate the intelligence.
“I think the Butler Committee really uncovered that the trade craft at that point
wasn’t as good as it should have been for validation … that’s one of the background
reasons why people were very unwilling to actually conclude: no … we may have
miscalculated, or misassessed this.”274
A LESSON LEARNED?
661.  As the current version of National Intelligence Machinery explains, JIC
Assessments put intelligence in the context of wider knowledge available and past
judgements and historic evidence.275 They also need to try to understand, drawing on
all sources at their disposal, the motivations and thinking of the intelligence targets
and sources.
662.  Reflecting the findings and recommendations of the Butler Review in relation to the
nature of intelligence and the way in which it was used before the conflict in 2003, the
document also states:
“Intelligence … may by its nature be fragmentary or incomplete. It needs to be
analysed in order to identify significant facts, and then evaluated in respect of the
reliability of the information in order to allow a judgement to be made about the
weight to be given to it before circulation either as single source reports or collated
and integrated with other material as assessments.
“SIS and GCHQ evaluate and circulate mainly single source intelligence. The
Security Service also circulates single source intelligence although its primary
product is assessed intelligence. Defence Intelligence produces mainly assessed
reports on an all-source basis …
273  Private hearing, Part 1, page 68.
274  Public hearing, 20 January 2010, pages 63-64.
275  Cabinet Office, 19 November 2010, National Intelligence Machinery, page 24.
409
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