1. Nutrients Manager, The Environment Agency, National Centre for Ecotoxicology and Hazardous Substances, Evenlode House, Howbery Park, Wallingford, Oxon OX10 8BD, UK
2. NVZ Manager, The Environment Agency, Anglian Region, Kingfisher House, Goldhay Way, Orton Goldhay, Peterborough PE2 5ZR, UK