"The United Kingdom (UK) is one of the major oil producers among IEA [International Energy Agency] member countries, and until recently, was one of only four IEA net exporting countries. However, the United Kingdom’s North Sea oil and gas production has been declining since its peak in 1999. In 2004, the country became a net importer of natural gas, and in 2006 it also became a net importer of oil." (Quoted from paper)