Cultybraggan Camp Cultybraggan lies close to the village of Comrie , in west Perthshire . It was first used as a prisoner of war ( PoW ) camp during World War II , and then became an Army training area . It later housed a Royal Observer Corps ( ROC ) nuclear monitoring post , and a Regional Government Headquarters ( RGH ) . The camp ceased to be used by the military in 2004 , and now belongs to the Comrie Development Trust , bought through a community right - to - buy option for £350 , 000 in 2007 . Some of the original 100 Nissen hut s on the western side of the camp were demolished in the 1970s to make way for a firing range , but the majority remain . The surviving huts , together with an assault course and modern Officers ' Mess facility , make Cultybraggan " one of the three best preserved purpose - built WWII prisoner of war camps in Britain " . In 2006 , a number of structures at the camp were listed by Historic Scotland . Huts 19 , 20 , and 44 – 46 are category A listed as being of national significance , while huts 1 - 3 , 21 , 29 - 39 , and 47 - 57 are category B listed . World War II . Named PoW camp No 21 , built in 1941 to house 4 , 000 Category A prisoners , Cultybraggan was a ' black camp ' , holding those considered the most committed and fanatical Nazi PoWs , mainly young Waffen - SS , Fallschirmjäger and U - boat crew . Army , Navy , Air Force and SS prisoners were held in separate compounds , as were the officers . An additional camp was located at Cowden , two miles distant . Ringleaders of the Devizes plot — to break as many as 250 , 000 PoWs out of camps across the country in 1944 and attack Britain from within — were sent to Camp 21 at Comrie . These included Feldwebel Wolfgang Rosterg , a known anti - Nazi who was sent by mistake . He was lynched , and five of the prisoners were hanged at Pentonville Prison for his murder , the largest multiple execution in 20th - century Britain . Post war . Following the war , in 1949 , Cultybraggan was opened as a training camp . It was used by the Regular Army , the Territorial Army and was popular with Cadet units for their annual camps . The camp covered some and could accommodate 600 personnel in a mixture of huts and tents . Units rotating through the camp enabled 80 , 000 ' man training days ' of military exercising , including adventure training , cross - country driving , and helicopter operations , using the 12 , 000 acre Tighnablair Training Area , leased from the Drummond Estate . Cold War . As part of the Cold War defence of the nation , an underground Royal Observer Corps ( ROC ) monitoring post was installed in 1960 . Although it closed in September 1991 , when the ROC was stood down , it is still accessible . In 1990 , an underground Regional Government Headquarters ( RGHQ ) bunker was completed in the north east corner of the camp site to replace the Scottish North Zone Headquarters bunker at Troywood ( Anstruther ) . In the event of war , the Secretary of State for Scotland , the BBC , British Telecom , and other important organisations would have operated from here . However , the Cold War threat receded almost as soon as the bunker was completed , and the £3 . 6 million , two storey , underground structure was declared obsolete , and closed . Sold to the Army , the bunker was added to the military training facilities . Comrie Development Trust . Since taking ownership of the site on 20 September 2007 , the Comrie Development Trust ’ s Cultybraggan Working Group have been working towards the sustainable development of this community asset . Major infrastructure works ( drainage , electricity , water and telecoms ) , the conversion of nine Nissen huts to make 12 units for local businesses and the refurbishment of the central mess are included in the first phase . In 2012 it was reported that a communications firm had purchased the underground bunker at Cultybraggan for use as a " digital safe house " . However , the bid failed and the bunker is back on the market . Future development plans for Cultybraggan include :