In Cramlington we frequently encounter pitch fibre pipe delamination creating progressive bore restriction in 1960s and 1970s housing in eastfield, northburn, and nelson village and accumulated pitch fibre flakes partially blocking lateral drains in ageing new-town housing. As a result, properties such as 1960s and 1970s new-town housing with pitch fibre pipes, modern housing estates, and commercial and industrial units can be particularly susceptible due to ageing pipework and mature vegetation.