Enforcement officers Wayne and Dan continue their mission to identify the gang responsible for one of the biggest fly tips in Cardiff, more determined than ever to catch their prey. Environmental health officer Suzanne pays a visit to a takeaway restaurant in Worcester, and a London canal side is the scene of a battle between council enforcers and a waste-loving artist who has hoarded mountains of rubbish.

David discovers a load of sex toys dumped in a farmer's field and Ray wages a one-man war on the irresponsible dog owners of Dorset. Clive and Callum face the prospect of cleaning up roadside laybys covered in human effluent.