has anyone ever successfully challenged a NHBC report and findings? I've have a situation where we have water dripping from the dry verges on the gable roof onto the window sill of our en-suite. This makes an incredibly loud noise when there is heavy rain, and wakes us in the night!!! Our developers (Linden) have refused to do anything, and I contacted NHBC hoping that they would see that there was a design flaw here, the verges are designed to drip excess water, which I have no problem with, its just not when there is a hollow plastic window sill below it. The report says no action required as there is no issue with the parts or fault with the construction. Mentions nothing about the design issue, and I feel is stitched me up in any future conversations I may have with the developer. I have challenged the report but was interested to see if anyone had ever been successful in doing this????