§ Mr. Mullin
The recent MAFF report "Rodent Infestations in domestic properties in England" covers this issue. MAFF's report tentatively suggests that there is a relationship between the incidence of blocked drains and outdoor rat infestation but this has not been supported with statistically significant analysis of the data so the conclusion needs to be treated with caution. Moreover, faults that might be expected to reflect a direct link with sewers, such as cracked or defective drains covers, were not found to be related to rat infestation. A copy of the MAFF report is in the House of Commons Library.