An entity that sells gas to an end consumer pursuant to a gas supplier licence or under an exemption under the Gas Act 1986. In Great Britain, a gas supplier only has a retail relationship with the end consumer and does not own or operate the local pipelines used to deliver the gas (the gas distribution network (GDN)). It does not own the gas while it is transported in the GDN or the national transmission system (NTS), nor does it arrange for the transportation of gas through those networks. That role is performed by a gas shipper, which may be a separately licensed company within the same group.