National policy statement for gas supply infrastructure and gas and oil pipelines (EN-4) /
Great Britain.Department of Energy and Climate Change.
London : Stationery Office,
2011.
Dated July 2011. Supersedes Revised Draft (ISBN 9780108509377), issued October 2010.
"URN 11D/714".
"Presented to Parliament pursuant to section 5(9) of the Planning Act 2008".