If your sink has become blocked in Little Shurdington, Gloucestershire the best thing to do is contact a professional drainage company who will be able to assess and unblock it. Common methods used for this include using a plunger or drain snake which involves inserting the flexible rod into the pipe to get rid of any blockage that may have built up over time. Another method includes pouring boiling water down your plughole if you think grease and build-up are causing an issue but bear in mind that things such as tree roots can often cause more serious problems with sinks and so require specialist equipment. Vinegar can also work wonders too - simply pour half a cup into each side of your plughole before leaving overnight then flush through with hot water again after 12 hours! If these simple steps don't work though it might be time to call an expert - good luck getting sorted quickly :)