Page last updated at 12:22 GMT, Sunday, 6 September 2009 13:22 UK

Huge collection of code machines

Code-breakers mark the 70th anniversary of the start of their work at Bletchley Park

The 70th anniversary of the start of World War II has been marked with a record-breaking exhibition of code-breaking equipment in Milton Keynes.

What is believed to be the largest ever collection of top-secret cypher machines has gone on show at the Bletchley Park code-breaking centre.

Seventy years since the outbreak of war 70 Enigma and other cypher machines have been brought together.

Britain's best brains spent the war cracking enemy codes at Bletchley park.

The machines on display were used by the Germans and their allies to keep their communications secret.

This week in 1939 code-breaking work started in earnest at Bletchley Park.

The codebreakers' success allowed the allies to know in advance what German forces were planning.

The Allied force's supreme commander General Eisenhower said this work shortened the war by two years.

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