The gas in your home or business is supplied to you by a Gas Supplier. Only suppliers licensed by Ofgem (Office of Gas and Electricity Markets - see www.ofgem.gov.uk) can sell you gas. You can obtain a list of gas suppliers from the energywatch website on the following link: www.energywatch.org.uk
National Grid does not sell gas.
If you know that you do not have an existing gas service or service pipe at your home or premise please refer to the Connections section of this website.