Editor's note

As London takes stock of the events of Wednesday afternoon, questions will naturally be asked about security in the city. The balance between safety and access to public spaces is always difficult to strike, particularly when the space in question is home to a nation's democratic institutions.

The attacker has now been named as Khalid Masood, a 52-year-old from Kent. But Channel 4 News originally named the wrong person – a man currently in prison. Richard Sambrook appreciates the quest for a scoop as much as anyone, but urges media organisations to be more cautious, even if they think Twitter users are beating them to the story.

As Prime Minister Theresa May prepares to trigger Article 50 next week, it's worth remembering that Britain has been here before. In 286AD, a Roman military commander named Carausius named himself emperor in Britain and announced a similar break with Europe. Adam Rogers tells the tale of Britain's bust-up with Rome – and reveals why it didn't end well.

This weekend, Comic Relief will once again be appealing to the kindness of strangers in the name of charity. Red Nose Day is a welcome chance to smile, give, and improve the lives of the less fortunate around the world. Jo Cutler explains the psychology behind the generosity which lifts our spirits.

Laura Hood

Politics Editor, Assistant Editor

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PA/Stefan Rousseau

Westminster attack: the questions security professionals will be asking today

Hervé Borrion, UCL; Kartikeya Tripathi, UCL

Even when a response goes to plan, lessons can be learnt.

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