After the fall of the Berlin Wall, thousands of documents were hastily shredded by the dreaded GDR political police. 16,000 bags filled with six million pieces of paper were found. Thanks to the meticulous work of technology, the destinies of men and women who had been spied on and recorded without their knowledge could be reconstructed.

With access to recently-opened court files, Julie Etchingham reveals some of the Stasi's UK operations and asks why its other secrets are yet to be revealed.