Had one a few years ago where there was a steel gas supply pipe capped off under the floor, while I was pulling some new cables in it got snagged and a little while later there was a smell of gas so got onto the emergency number and they came out and found that it was quite an old pipe that was perforated they dug a hole in the garden just outside the house to expose the pipe and did a temporary cap on the pipe they came back some weeks later and capped it in the road
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