If your sink is blocked in Parkfield, Gloucestershire there are several methods you can try to clear the blockage. Firstly, you should use a plunger to create suction and breakdown any debris that may be blocking the plughole. If this does not work then using boiling water can help dislodge some gunk inside too just pour it down at intervals for best effect. You could also add white vinegar or baking soda followed by hot water, which helps naturally break up scum over time (mostly overnight). As another technique look under your sink cabinet - often drain lines have bendable hoses where food waste gets trapped causing blocks; simply remove them one-by-one carefullly untwisting each 'hoselock' connection with an adjustable spanner if necessary to see what's clogging up within. Lastly depending on how bad your blockage is; invest in getting hold of a plumbing snake/drain rod or hire out such professional equipment from local DIY stores so as make sure all dirt has been removed effectively before reassembling everything again properly once done