What the sign can tell us
A change in flow or pressure is not by itself proof of a leak. Supply conditions and fittings may need consideration before hidden pipework is investigated.
Useful details to record
Describe which outlets are affected and whether the change is constant or intermittent.
Include your postcode, the affected place and any earlier investigation. A concise history helps distinguish a repeating pattern from a one-off observation.
Where an investigation may begin
Look along the incoming supply.
Mains water leak detectionKeep the next step proportionate
A symptom alone does not identify a faulty pipe. Suitable investigation connects the observation with a cause before access or repair is proposed. If findings point outside plumbing, the recommendation should reflect that.
If water is actively escaping
For immediate danger, keep away from unsafe areas and use the appropriate emergency or urgent assistance service. Website enquiries do not dispatch emergency help or guarantee an attendance time.
Read the active-water guidance