Internment of enemy aliens means that many existing German spies are put in camps.
	November	Fougasse is asked to design a series of posters for the "Careless Talk Cost Lives" campaign.
	August	British intelligence starts to intercept German intelligence signals.
	June	Government introduces fines of up to £50 for spreading panic rumours about spies.
	3 September	The first German 'invasion spies' arrive in Britain. All are captured within hours.
		MI5 now employs 868 people (an increase of over 700 since 1938).
	January	The XX Committee is established to run the British 'double cross' agent system.
	December	Codebreakers at Bletchley Park are able to break German code.
		Early 1942. The freelance double agent GARBO arrives in Britain. He leads many successful operations.
	October	The London Reception Centre is established. Its job is to identify spies entering the country disguised as refugees.
		Germans fail to realise that their spies are now double cross agents working for the British. The missions given to their spies reveal German military plans.
		Study of German intelligence records shows that all 115 agents sent to Britain were identified and caught.