Monday, September 13, 1999 Published at 15:22 GMT 16:22 UK
Spies who betrayed Britain
The UK has been shocked by revelations that an 87-year-old great-grandmother and a Scotland Yard detective spied for the former Soviet Union. Both were exposed in the archive of KGB documents smuggled to the UK by Russian dissident Vasili Mitrokhin.
Former secretary Melita Norwood, now 87, began providing information to the KGB in the 1930s, making her the longest-serving Soviet spy.
Former KGB officer Colonel Vasili Mitrokhin spent 10 years copying files before he defected to Britain. BBC News Online profiles the man who unmasked Melita Norwood.
The most successful spy of the Cold War era now spends her days pottering about her garden and making jam in her south London home.
The most famous spies in the UK became known by the KGB as the 'magnificent five' but were better known in Britain as the Cambridge spy ring.