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Hi I have been offered subbing work with a firm who are switching people from gas to heat source pumps. As the GSR team member it's my job to disconnect and make safe the old boiler installs. This would obviously involve capping off the old supply and shutting off the ECV. I've referred to all of my GS literature but cannot see if I need to inform the ESP/Transco/Supplier and whether they also would need to complete any sort of gas isolation. Any guidance would be greatly appreciated. Thanks Matt