Emergency leak tools
Tonight there are two tools on offer. The first decides between phoning at once and leaving a leak until the morning, and the second gives a list of what to photograph for the engineer. The reasoning behind each is shown in full on its page, and both are advice only, since neither can look inside a pipe.
Getting a useful result
Base every answer on what is visible at this moment, and skip a field if you are unsure instead of guessing, because a doubtful input yields a confident but unreliable result.
These checkers only narrow things down. Walls and floors hide a lot, so take a result as grounds to act and not as a finding. A tool that finishes by saying call now is working as designed.
Can you smell gas? Leave doors and windows open, stay away from switches and naked flames, take everybody outdoors and ring the National Gas Emergency Service on 0800 111 999. Make that call before any other.
Is water running close to electrics, or is a pipe flooding the property? Turn off the water at the stop tap. When the consumer unit can be reached without wading through water, cut the electricity there. Stay away from wet sockets and light fittings.