In November 2015 I had the roof of terraced flat repaired/replaced (20 year guarantee on both labour and materials - ha ha!). The work involved repairing/replacing rotten timber and strengthening the roof where it was no longer supported by an internal wall (removed by previous owner). The contractor mentioned Building Control and consulting a Structural Engineer but when I contacted Building Control they knew nothing of the job. The roof is very poorly done, there have been a number of leaks and the structural work is badly done. The contractor has been back numerous times to correct many thi