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Its all guesswork I think. In 1996 NCA say 36 - 90 billion UKP , based on applying an 'IMF' guesstimate that money laundering transactions may equal 2-5% of GDP.pic.twitter.com/8n9eQqWTY7
This figure comes from a speech that Michel Camdessus made in 1998 https://www.imf.org/en/News/Articles/2015/09/28/04/53/sp021098 … and no one has been able to find the workings for that number.
Most estimates that get to this range are some extrapolation from estimates of overall proceeds of crime http://www.unodc.org/documents/data-and-analysis/Studies/Illicit_financial_flows_2011_web.pdf … rather than from amounts involved in money laundering cases.pic.twitter.com/LJR6t2eFQQ
Thanks for the provenance.
Its nearly midnight, so maybe not thinking clearly, but I'm beginning to worry that behind a lot of the popular "big numbers" someone, somewhere, sometime, arrived at a number for a specific purpose. But once made they took on a life of their own. 
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How do YOU think we should combat dark money? 
