Now that we in the West have entered a new phase in our relationship with Russia, it’s worth recalling the Cold War when Britain was a battleground of espionage.
In 1970, there were so many Soviet intelligence agents operating undercover in London that MI5 was hopelessly over-extended. The scale and extent of KGB espionage operations in the UK, threatening to overwhelm not just MI5 but the security of the state. It resulted...