Where did he say he could smell gas?
Geez..some people.
He doesn't, thats why |i said he is paranoid!
But you have described, on an open forum, a methodology which is not appropiate. You have to assume that somebody will read it and utilise it as a test method.
I'm not a gas fitter, or work with gas.
It's my opinion, I'm entitled to it, I've seen it being used and is, in my opinion a viable way of checking what the op is worried about.
If the pipe is leaking, the meter will move, even by a tiny amount.