Someone said :
Got the annual gas boiler service done today. The engineer did a new process, where he checked the pressure at the meter. He came out to it four times. (I was working away beside it, painting the side gate.) On his fourth visit out, I asked if there was a problem. Yes, there was, the gas pressure was dropping, so there was a leak in the line. He eventually found it, at the unused plug for a gas cooker.
I wonder how long I've been living with a gas leak in my kitchen.
Just a guess but, i bet you spent a large amount of the day watching him bent over your pipes..