These estimates have been produced from research commissioned by the Home Office and carried out by experts in drug use prevalence estimation from the Centre for Drug Misuse Research, University of Glasgow and the National Drug Evidence Centre, University of Manchester (Hay, G., Gannon, M., MacDougall, J., Millar, T., Eastwood, C. and McKeganey, N (2008) National and regional estimates of the prevalence of opiate use and/ or crack cocaine use 2006/07: a summary of key findings. Home Office Research Report 9. London: Home Office).
In addition, we strongly recommend that you read the guidance notes that have been produced as an aid to interpreting the estimates for needs assessment and service planning at the local level. This can be found in the ‘needs assessment’ area of the NTA website.