1. Ministry of Agriculture, Fisheries and Food, Directorate of Fisheries Research, Burnham‐on‐Crouch.
2. Institute of Hydrology, Wallingford.
3. Formerly National Rivers Authority, Cardiff. Now with Wallace Evans, Engineering and Environment Consultants and Project Managers, Bridgend.
4. ****Building Research Establishment, Watford.
5. *****ADAS Rosemaund, Hereford.