Editing MI5 (section)

==Buildings==
MI5 was based at Watergate House in the [[Strand, London|Strand]] from 1912 until 1916, when it moved to larger facilities at 16 [[Charles II Street|Charles Street]] for the remaining years of the [[World War I|First World War]].<ref>{{Cite book|last=Andrew|first=Christopher|title=The Defence of the Realm: The Authorized History of MI5|page=[https://Archive.org/details/defenceofrealmau0000andr/page/85 85]|publisher=Allen Lane|year=2009|isbn=978-0-713-99885-6|url=https://Archive.org/details/defenceofrealmau0000andr/page/85}}</ref>  After the First World War, it relocated to smaller premises at 73–75 [[Queen's Gate]] in 1919,<ref>{{Cite book|last=Andrew|first=Christopher|title=The Defence of the Realm: The Authorized History of MI5|page=[https://Archive.org/details/defenceofrealmau0000andr/page/117 117]|publisher=Allen Lane|year=2009|isbn=978-0-713-99885-6|url=https://Archive.org/details/defenceofrealmau0000andr/page/117}}</ref> and then moved to 35 [[Cromwell Road]] in 1929, before transferring to the top floor of the South Block of [[Thames House]] on [[Millbank]] in 1934.<ref>{{Cite book|last=Andrew|first=Christopher|title=The Defence of the Realm: The Authorized History of MI5|page=[https://Archive.org/details/defenceofrealmau0000andr/page/134 134]|publisher=Allen Lane|year=2009|isbn=978-0-713-99885-6|url=https://Archive.org/details/defenceofrealmau0000andr/page/134}}</ref>  The Service spent the first year of the [[World War II|Second World War]] at [[HM Prison Wormwood Scrubs|Wormwood Scrubs]], before moving to [[Blenheim Palace]], Oxfordshire, in 1940.<ref>{{Cite book|last=Andrew|first=Christopher|title=The Defence of the Realm: The Authorized History of MI5|page=[https://Archive.org/details/defenceofrealmau0000andr/page/217 217]|publisher=Allen Lane|year=2009|isbn=978-0-713-99885-6|url=https://Archive.org/details/defenceofrealmau0000andr/page/217}}</ref>  After the Second World War, MI5 was based at [[Leconfield House]] (1945–1976), and [[140 Gower Street]] (1976–1994, since demolished),<ref>{{Cite web|url=http://www.GeoCities.ws/foxeye121/curzon.htm|title=MI5 (The Security Service)|website=www.GeoCities.ws|publisher=The Secret Architecture of London|access-date=18 February 2017}}</ref> before returning to Thames House in 1994.<ref>{{Cite book|last=Sheldon|first=Robert|author-link=Robert Sheldon, Baron Sheldon|date=June 1993|title=Thames House and Vauxhall Cross|url=http://www.NAO.org.uk/wp-content/uploads/2000/02/9900236.pdf |archive-url=https://web.archive.org/web/20140222043827/http://www.nao.org.uk/wp-content/uploads/2000/02/9900236.pdf |archive-date=22 February 2014 |url-status=live|publisher=[[National Audit Office (United Kingdom)|National Audit Office]]|location=London|isbn=978-0-10556-669-4|page=43|access-date=7 July 2013}}</ref>

The national headquarters at Thames House draws together personnel from a number of locations into a single HQ facility: Thames House also houses the [[Joint Terrorism Analysis Centre]] (JTAC), a subordinate organisation to the Security Service; prior to March 2013, Thames House additionally housed the [[Northern Ireland Office]] (NIO).  The service has offices across the United Kingdom, including a HQ in [[Northern Ireland]].<ref>{{Cite web|title=Intelligence, counter-terrorism, and trust|url=https://www.MI5.gov.uk/home/about-us/who-we-are/staff-and-management/director-general/speeches-by-the-director-general/intelligence-counter-terrorism-and-trust.html|website=www.MI5.gov.uk|publisher=MI5|date=5 November 2007|access-date=8 January 2015}}</ref> Details of a northern operations centre in [[Greater Manchester]] were revealed by the firm who built it.<ref>{{Cite web|first=David|last=Leppard|date=14 June 2009|url=http://www.TimesOnline.co.uk/tol/news/politics/article6493658.ece|title=Oops! Building firm blurts out secrets of hush-hush MI5 HQ|website=www.TimesOnline.co.uk|publisher=[[The Sunday Times]]|access-date=28 December 2011|archive-url=https://web.archive.org/web/20100615225627/http://www.timesonline.co.uk/tol/news/politics/article6493658.ece|archive-date=15 June 2010|url-status=dead}}</ref>