We have a 4-bed detached house and have a persistent leak coming through into an upstairs bedroom. Over the last 3-4 years, we have had 3 different roofers (at significant expense running into thousands) work on it to repair the area of roof, which should have fixed the problem but each time we have substantial rain it continues to get damp patches. Now we have 2 other areas downstairs affected, and the original leaky patch appears to have developed mould. Frustrated to the hilt - any advice! Can we get the last lot of roofers back to have a look and try to fix it free of charge?