https://www.dailymail.co.uk/news/article-4980618/Nazis-secretly-tortured-death-Britain-named.html >>New details of the methods used inside the Cage have been uncovered by the historian who studied now declassified documents. >>They reveal that Colonel Scotland, who was one of the heads of MI9, sanctioned the use of experimental truth drugs and hypnosis on prisoners. If they failed to cooperate they could be subjected to ‘secret control gear' - thought to be electric shock equipment and other torture apparatus. And they could be thrown into the basement’s notorious cell 14, from which the overpowering stench of dead rats and rotting flesh emanated. >>Scotland was accused of using ‘Gestapo methods’ by the then head of MI5’s counter-intelligence section in his diary. >>The Cage is where the toughest German POWs, who could not be broken in normal interrogation, were taken to be subjected to ‘special intelligence treatment’. >>It comprised three mansions located on secluded Kensington Palace Gardens - a stone’s throw from its namesake - which was, and still is, one of the country’s most exclusive addresses, known as the ‘Boulevard of Billionaires’. >>However, its magnificent exterior masked its dark secrets. The stucco mansions were requisitioned in October 1940 - one from the estate of the late Lord Joseph Duveen, a Jewish art dealer who was friends with Edward VII - and within eight days the first German POWs began to arrive. >>The interrogation facility soon became embroiled in a heated controversy between MI5 and MI6 over the use of violence and unorthodox methods.