I travelled to Eaton Socon to visit a shop and decided the have have a short walk. I found a bench and stopped to eat a banana and take a drink. It was only 2c. Luckily the air was fairly still otherwise may not have smelt gas, I asked a passerby if she could confirm it but she said she couldn’t. Several hours later i compared what I had seen on may walk to OSM and remembered the gas smell and Goggled “ gas smell” and the suggested action. I rang the number and explained what I had noticed. Thirty minutes later an engineer rang to ask for first hand description and location, I gave him the details, using OSM to remind me of what was around, I asked if he would let me know the result he he did find a problem. An hour later he called again and confirmed there was a leak and it seemed to be from the gas main under road and would probably be a major disruptive problem to fix.
https://www.openstreetmap.org/?mlat=52.21025&mlon=-0.28966#map=19/52.21025/-0.28966&layers=N