With a few hot days I decided to plunge into fixing the outside drainage. These had been marked the wrong way around on the surveyors map which carried onto the Architects drawings which made its way into the construction drawings and the groundsworker dutifully connected up as per these last year. It was only a few months ago I noticed backflow of sewage in what I thought was the storm drain and discovered the difference between 4" sewer lines and 6" storm drain lines!! Unfortunately the 4,000