You might hear a gurgling or "plop plop plopping" sound. You most likely have a Blocked Drains Croydon if your toilet takes a long time to flush, your sink won't drain, or you hear an unpleasant glug coming from your drains. Blocked drains are, as we all know, a minor annoyance at best, and a persistent nuisance at worst, requiring immediate attention.  Either way, it is the most...