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If it were my family ?
Get a Plumber/Gasfitter to look at it... no question
Sulfur and rotten egg gas are noxious, Natural Gas is highly combustible and if contained may explode
That it has been ongoing for some time only indicates that no-one has bothered rather than all is OK
Now, before we finish, the Rating System needs you to give a Star Rating in order for the exchange to be finalised, so please give your honest assessment if you feel you had positive outcome.