OP I don't normally comment on here, I'm a reader usually.
However, I feel complelled to reply to you about this topic.
Firstly no body should ever mess about with gas installations or electrictricity for that matter, both have the ability to kill people and cause dreadful distruction, so unless you are a qualified and certified gas engineer, I advice you to get this horrific idea out of your head.
Secondly, if you are living in rented accomadation, be it via social housing or a private landlord, you would have to, by law, seek their permission before you even attempt such a rediculous thing.
Are you aware that if you were to attempt your experiment and it went tragically wrong and caused a massive explosion causing loss of life, you would be held responsible, if you were still alive that is! You would probably be arrested and charged with manslaughter? Aside from that, you would also have to live with knowing that lives were lost due to your utter stupidity!
Of course, we all seek to try to save money and keep our costs down, but in some circumstances, this being one of them, safety, of not only you, but of everyone around you must be paramount to all else.
Contact your local council and ask if you can apply for any grants for things like loft insulation and things like that, I know that some councils offer these to their residents.
Ask your energy supplier to come and visit your home and give advice on fuel saving tips.
But PLEASE! PLEASE! do not even think about your horrific idea anymore, not minding if you blow yourself out of this World is one thing, but you have NO right whatsoever to place others at risk.
Sorry for caps peeps, but I feel they're needed here.
