The newly-declassified documents include details about some of the UK's most notorious spies.

Some advice was to not wear false beards, carry plenty of spare change and engage in a good cover story.

Anthony Blunt confessed in 1964 to being a Soviet agent, but Elizabeth II was not informed.

Only very special guests were invited to sign - some left detailed and personal messages.

Newly-released papers show John Major was told Churchill's private archive could be broken up.

The two-time prime minister agreed to sell his entire archive to fund his care towards the end of his life.

The sweater was intended for a woman in Denmark before the British Navy seized it from a cargo ship.

It is among the contents of packages seized by the Royal Navy in 1807, and opened for the first time.