Acknowledgements Stanger Science & Environment and NETCEN gratefully acknowledge the assistance of the local site operators from: London Borough of Bexley Birmingham City Council Cardiff City Council Glasgow City Council Leeds City Council Manchester City Council Newcastle City Council Southampton City Council Belfast City Council Bristol city Council Edinburgh City Council Hull City Council Leicester City Council Middlesbrough City Council Sheffield City Council Southampton City Council Swansea City Council Wolverhampton Metropolitan Borough Council

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Study undertaken jointly by Stanger Science and Environment and the National Environmental Technology Centre.
Site prepared by the National Environmental Technology Centre, part of AEA Technology, on behalf of the UK Department of the Environment, Transport and the Regions