1. Brunel University, Uxbridge, Middlesex, UB8 3PH, Waterlooville Laboratory, National Laboratory Service,Environment Agency, 4 The Meadows, Waterbury Drive, Waterlooville, Hampshire, PO7 7XX, Hanningfield Treatment Works, Essex and Suffolk Water, South Hanningfield, Chelmsford, Essex, CM3 5HS, LimnoMar, Bei der Neuen Muenze 11, D-22145 Hamburg, Germany