Doing the kitchen this break and after stripping wall paper I was tidying up and could hear a buzzing sound, first thoughts were of an insect caught in the paper on the floor but after clearing up could still hear it.
What had happened was that water from stripping the paper had dropped onto the gas pipe that led to my cooker and a small leak was causing the water to bubble creating the buzzing sound!
How lucky was that? It is a very small leak at the site of a connection and could have been leaking for a long time but you cannot tell, anyway, gas off at meter for now.
Query, do I call British Gas or a local engineer? Probably covered on house insurance but need to check.
Checking for gas leaks on pipe joints (they usually occur at compression joints) is a relatively easy process. Get an empty liquid soap bottle and put an inch of washing up liquid into it. Then add an inch of water and shake gently.
Squirt a little of the resulting mixture onto the suspect joint and watch - you'll see large bubbles forming and bursting if there's a leak.
Regarding the gas safe checks, we have them done every year by our services utility provider. They provide the service via a contractor, and I have never seen the different engineers who have visited, do the same supposed safety checks ever. Taking this up with the utility company, they have still not provided a reasonable answer, as to what should be provided.
I once had reason to complain to Corgi (before the name change) about a central heating installation, that one of their members had undertaken. All they were interested in was the one metre of gas pipe from the ground to the boiler. That incident ended up in the local small claims court.