Water Framework Directive River Basin Management Plan Cycle 2 Infaunal Quality Index classification data used for the Marine Strategy Framework Directive Article 8 biodiversity assessments for the UK Regional Seas. The WFD Infaunal Quality Index method statement and classification tool (‘IQI Workbook UKTAG v01 20140311.xlsm’) used to calculate WFD Ecological Quality Ratios are available at http://www.wfduk.org/resources%20/coastal-and-transitional-waters-benthic-invertebrate-fauna. Project coordinated by the Environment Agency and Joint Nature Conservation Committee. River Basin Management Plan Cycle 2 benthic invertebrate data held by the relevant WFD Agency.