1. Institute for the Environment, Brunel University, Uxbridge, Middlesex, UB8 3PH, U.K.
2. Severn Trent Services, Britten Road, Reading, Berkshire, RG2 0AU, U.K.
3. Environment Agency National Coarse Fish Farm, Moor Lane, Calverton, Nottingham
NG14 6F2, U.K.
4. WatStech, The Technology Centre, Wolverhampton Science
Park, Wolverhampton,
WV10 9RU, U.K.