This is the report of an independent study of Waste Electrical and Electronic Equipment (WEEE) flows in the UK. The objective of the study was to develop a robust inventory of the different routes by which EEE and WEEE flow through the UK economy, as a basis for recommendations to improve recycling. There is known to be a discrepancy between the amount of electrical and electronic equipment sold (put on the market) in the UK and the amount of WEEE reported as collected and treated. A widely cited explanation for this has been that a significant amount of activity related to EEE has not been reported. Material Focus commissioned Anthesis Group, with the University of Lancaster, Repic and Valpak, to produce a consolidated picture of unreported WEEE collection and processing in the UK. The study was to characterise the types of undocumented collection and treatment of WEEE and quantify undocumented flows; and identify actors involved in unreported WEEE collection and treatment.