What is the structure of the natural gas industry in GB? The GB natural gas industry can be broadly divided into three sectors: • upstream—the upstream sector involves exploration for and production of natural gas, both onshore and offshore. In the UK, petroleum production and exploration is regulated pursuant to the Petroleum Act 1998, which establishes a licensing regime. The upstream sector also includes the preliminary processing of the petroleum and transportation by pipeline to onshore terminals • midstream—the midstream label is usually used to describe the gathering, transportation, processing and storage of petroleum, to the extent it is not upstream or downstream (see below). It also includes the liquefaction, transportation and gasification of liquefied natural gas (LNG) • downstream—the downstream sector covers the transmission, distribution, marketing and sale of natural gas, as well as products derived from natural gas. There is some overlap between what is considered to be midstream and downstream, but generally what happens to natural gas once it enters a regional pipeline transmission system is considered to be downstream The