Background Bought a Bellway in June 2012. Started having a lot of problems after about 3 months. Buzzing sounds coming from attic space above the loft bedroom! To my horror....when opening the attic hatch....there were flies flying around. Apparantly, we had a cluster fly infestation. Bellway sent pest controller after 4 months of constant nagging. Also...took pictures of loft trusses....something doesn't look right here. Should the truss be cut at the hip like this? And what is the brown thing at the gable end hip joint? Breeze block at this gable looks like it has damp on it. I have also attached pictures of the other side of this gable wall ie: the external wall of this gable wall. There are 3 cracks along this UPVc verge board Water ingress under roof tiles on backer-board? Flashing on roof-lights has been installed incorrectly. Bellway was notified in March 2013. NHBC was notified in August 2013. To date...nothing has been done about it. Below is now the result of the recent winds we had during Christmas!! On windy days....there is a draught thoughout the loft bedroom which doors clattering or banging shut and it feels like roof is about to take off in the wind! I forgot to add....the tile clips at this particular hip joint are also loose...and the tiles keep clattering the wind as well....so we have stereophonic clattering sounds...from the flashing as well as the tiles.