If you have a blocked sink in Damery, Gloucestershire, the first step is to see what could be causing the blockage. It's possible that there may be foreign objects blocking the pipes or a simple build up of dirt and debris over time has resulted in drainage problems. Try using a plunger push down firmly on it several times with water inside your sink and this can sometimes clear minor blockages without any hazardous liquids needed! Also boiling some hot water and pouring it slowly into your drain can help loosen tough grime accumulations which are not responding to manual plunging techniques. If all else fails then it might be worth renting an industrial plumbing snake tool from local DIY stores which will force its way through obstructions more effectively than regular shop-bought methods like bottle plugholes or store bought acidic chemicals for drains such as vinegar based solutions; however always use caution when trying these rooter snakes because they do operate under intense pressure! Professional services should also work if difficult signs present themselves but bear in mind getting someone out won't always come cheap so try yourself first - good luck!