trace / no trace

Maybe I don't get out enough? Yesterday's excitement came courtesy of a gas man who turned up when I reported a leak outside when I got home from work.
It was one of those times when I wasn't really sure whether to do anything or nothing. I got my son to give a second opinion and he could smell gas too so it wasn't just in my imagination. But it wasn't a strong smell so there's always the worry you're wasting someone's time. Anyway the kindly man answering the phone said I'd done the right thing, and the guy who turned up did locate the leak further down the road. I was very impressed by the thorough testing, he waved various machines around inside and out, and drilled holes in the pavement and all in all kept me entertained for a good couple of hours. A busy evening made busier, and I'm glad we didn't have to evacuate or anything, so this morning am focussing on being grateful.

NT means no trace of gas apparently. all clear from this hole outside my house :)