On Sun, 30 Sep 2012 20:13:04 +0100, Nick Odell wrote:

It's the difference between a reliable job and the possibility of
this: http://www.bbc.co.uk/news/uk-england-11671916



I moved my boiler recently and being the worrier that I am I have to keep
testing it so that I don't fear blowing the street up.

In order for an explosion like in the link above, I presume it would be
impossible for enough gas to leak into an occupied house without an
overpowering stink.