At first I thought I had a gas leak since that's what I smelt, luckily the boy's at your choice plumbers came to my rescue, Sam (the plumber who came) told me that it was in fact an old gas pipe that had been disconnected, he was very efficient in finding the problem and solving it, I would definitely tell all my friends (although I already have!). Your choice plumbers are great and I would recommend them to fix your plumbing problems.