Glenda Jackson told members in the Commons she believed Thatcherism brought the "most heinous social, economic and spiritual damage upon this country, upon my constituency and my constituents."
Some responded to her criticism with shouts of "sit down".
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The world is facing a "global health emergency", according to the World Health Organisation (WHO).
A 25-year-old man has been arrested in Newport, South Wales, in connection with the Parsons Green terror attack, Scotland Yard said.
A milder night ahead with some cloud low enough to be misty in places.