This is a report carried out by CABI (the same group who have been testing biological control agents for some invasive plants) on behalf of the UK government.
Not sure if this has been posted before but it certainly has some interesting figures which are worth quoting if you are ever having to justify INNS control work.
https://secure.fera.defra.gov.uk/nonnativespecies/downloadDocument.cfm?id=487
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