If your sink is blocked in Church End, Gloucestershire It's important to act quickly. There are a few methods you can use to clear the blockage yourself or have an experienced professional do it for you. First and foremost try using a plunger this could be all that's needed - simply place the cup of the plunger over the plug hole, fill enough water into your basin so that when moving up and down with some force allows air flow between itself and sink bottom creating suctioned power to dislodge mechanical blockages such as hair lodged traps etc. Repeat several times until satisfied there has been improvement but if not advancing then move onElse examine any piping leading away from U bends under-the-basin linking taps & wastewater systems together; usually wooden chopsticks aid performance within tight spaces which remedy build-ups without disassembling drains also warm/hot boiling bottle based items dropped inside aided by worked connections (forwards 'n' back) should do trick(assuming no hidden nasty chemicals at hand). Sometimes blunt plastic ribbed snakes may work too though caution needs taking. Finally, heavy-duty chemical drain cleaners allow various directions depending upon occasion, although care must have taken around children / animals & irreversible effects maybe apparent after utilization therefore frequently overlooked these days due largely ethical environmental constraints including potential hazardous toxicity towards wildlife situations. Good luck!