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The former head of MI5, Lady Manningham-Buller, has described the scale of the terrorist threat facing the United Kingdom as "unprecedented". She told peers the number of potential plots had grown enormously since the July 7th attacks 12 years ago. Joanna Shinn reports. You can hear more on all of the day's events at Westminster in Today in Parliament, weeknights on Â鶹Éç Radio 4 at 23.30, or catch up via the Â鶹Éç iPlayer.