You will probably have received a letter from your gas supplier informing you of an impending inspection. It is likely, if you have a buried metal gas supply pipe, that they will recommend its urgent replacement with a non-corroding plastic pipe.
Works of excavation in consecrated ground will require faculty consent. However, given the potential danger of the old pipes, and the need to keep churches heated in the winter, this consent can be grated on an emergency basis, and should take only a few days. The process is made simpler if the new pipe is run along the same route as the existing pipe.
If you need to seek an emergency faculty, please contact Susan Black at the Diocesan Registry: Susan.Black@1THESANCTUARY.COM