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Dame Judi Dench on her Bond 'responsibility'

5 October 2012 Last updated at 14:59 BST

The James Bond franchise is marking 50 years since the first film, Dr No, was released.

Dame Judi Dench, who is set to return in her seventh 007 film as M in Skyfall, says James Bond is a "national hero".

The actress told the BBC's Lizo Mzimba that she didn't realise the "responsibility" of playing M when she first took on the role in 1995.