MI5 files suggest queen was not briefed on spy in royal household for nine years

Documents indicate monarch was informed Anthony Blunt was Soviet agent in 1973, though he confessed in 1964

The late Queen Elizabeth II was not told for almost 10 years that Anthony Blunt, a surveyor of the queen's pictures and a member of the royal household, had confessed to being a Soviet double agent, previously secret security files suggest.

Declassified MI5 documents throw intriguing new light on how the security services closely guarded news that the art historian, of the notorious Cambridge Five spy ring, had confessed in April 1964, with records indicating the queen was only informed in 1973.