When blockages cannot be cleared, further investigation is needed to identify the cause of the blockage and determine the best solution. Drainage defects can cause other problems such as smells, leakage, or subsidence. In all these cases, investigation is needed, and this usually entails dye testing, CCTV work and electronic detection of the position of defects. We undertake all these services, give clear advice as to the solution of the problem and provide written reports to support insurance claims regarding your responsibility.