Home Office Minister James Brokenshire has said he will listen to concerns on the 'snooping bill' but added there is an urgency to get it through to protect the public.
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The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
There are reports that at least some MPs and Lords have been left unable to access their emails as a result of the attack.
Cuillin, six, and four-year-old Lejla designed the memorial plaque to their mum that has been installed in the Commons chamber.