A Guild of Master Chimney Sweeps (GOMCS) Certificate importance cannot be underestimated, they set the industry standard and are (and always have been) the industry lead when it comes to maintenance of any appliances with a flue (chimney).  All work is covered and guaranteed by the industry standard, GOMCS Certificate. This proves to you and your insurance company, that all works on your appliances and flues complies to a regulated standard and complies with all current building and government regulations. Moreover, using CCTV, (see our dedicated CCTV Flue inspection page) ClearFire can advise you of problems up your flues before you are even aware they may be a problem.