The former naval communications headquarters at Portland is one of several structures which Historic England is assessing as part of the East Weare's C19 and C20 military structures project. The underground headquarters were completed in 1941. They were reconfigured in 1952 as a standby operational headquarters for Portland Dockyard but by the late 1960s the headquarters had been abandoned.

Based on the available information and with reference to the Department of Culture, Media and Sport's policy document entitled `Scheduled Monuments and Nationally Important but Non-Scheduled Monuments' (October 2013), including our Selection Guides, Portland naval communications headquarters is not recommended for scheduling for the following principal reasons:

* Historical importance: they are not associated with a particular significant military campaign; * Survival: the original fittings and plant were removed in the 1950s when the layout of the tunnels was reconfigured. Subsequent fittings have also largely been removed and whilst the tunnel complex survives well the extent of alteration has diminished their interest and integrity.

SOURCES

http://www.portlandhistory.co.uk/portland-naval-communication-headquarters.html, date accessed 21 February 2017

http://www.subbrit.org.uk/sb-sites/sites/p/portland_naval_hq/index1.shtml date accessed 21 February 2017