If a member of the public notices the plume from the main stack is grounding and is causing an odour issue please report it on Natural Resource Wales 24-hour incident hotline 03000 65 3000. It would be useful to include exactly where the plume is grounding, a description of the odour, weather conditions and wind direction if possible. These complaints will get forwarded to Elizabeth Voice as the Regulating Officer for Knauf, and to the operator. Details can be kept private from Knauf.