Philby

According to the transcript of the pair's conversation, Philby confessed that he found life at MI6 like a "controlled schizophrenia".

Philby would go on to tell his then friend that "if he had his whole life to lead again, he would probably have behaved in the same way".

Shortly before the end of the war, Philby was promoted to head of MI6's anti-Soviet section - meaning he was in charge of running operations against the Soviets while operating as a KGB agent.

This includes the never-before-seen paper version of the first-hand account of Cambridge spy Kim Philby's confession.

Philby's confession to his long-time friend and fellow MI6 officer Nicholas Elliot is shared in the exhibition and sheds details on the dramatic confession he made in January 1963 - including that the double agent would do it all again.