Please see the following note issued by SCDC and contact your District Council if you wish to report it further.
Odour from the land
In dealing with complaints relating to the spreading of manure or slurry on the land, Environmental Health Departments follow the informal advice provided by the Department of Environment, Food and Rural Affairs (DEFRA), which is that ‘manure or similar should be ploughed in within 72 hours of it being spread.’
It is accepted that there is to be a certain degree of odour arising from this activity. If odour is experienced after this period and its source is identifiable, Environmental Health Departments can investigate to establish whether it is causing a statutory nuisance.