Find the reason it won’t drain.

A recurring blockage needs a useful history.

When a problem returns, tell us how long the previous improvement lasted and what was done. Repeated slow draining, changes after heavy rain and water appearing at another fixture are details worth recording.

Let us know if a chemical drain cleaner has already been used, including the product name if available. Do not mix products or add more while waiting for advice. That information matters to anyone inspecting the pipework.

Some drainage enquiries involve private pipework; others may need to be directed to a water company, property manager or specialist service. Give the location and what you have observed so the next step and scope can be discussed before work is arranged.