Friday, September 17, 1999 Published at 01:45 GMT 02:45 UK
Spies unlike us
M15 gave advice on how to spot a German spy in World War Two
Strange clothes and foreign chocolate were seen as tell-tale signs that someone was a German spy in Britain during World War II.
This MI5 advice on spy-spotting, which was given to the Home Guard, is among previously classified documents which have been released by the Public Records Office.
The infiltrator may have been slightly injured, so the Home Guard were told to watch out for scratches and limping.
A German probably would not have known where he was, so questions such as "Where are you?", "Where are you going to?", and "Where do you come from?" were suggested by MI5.
The spy would almost certainly be wearing civilian clothes, said MI5, "but they might have a queer cut".
Other potential giveaway signs were that he may have been carrying a wireless transmitter, foreign chocolate, food with paper showing its foreign origins, or foreign matchboxes.
Other documents reveal that one of Britain's most notorious wartime traitors was motivated by a deep hatred of Jews and Bolsheviks.
John Amery, the son of Leo Amery, the Secretary of State for India in Churchill's government, was executed for treachery in December 1945.
The previously-classified documents tell how he made pro-Nazi broadcasts to German-occupied countries and spoke of the threat posed by Bolshevik Russia.
One of Amery's anti-Semitic outbursts came in a May 1944 lecture.
"At present ... the government of England have associated themselves with Jews to acquire the wealth of the world," he said.
An MI5 report declared his conduct was clearly treacherous: "A jury trying any such case would return a verdict of guilty without leaving the box."