Hundreds of students are taking part in a 'Day of Action' protest after accusations of police "brutality" during a previous protest.
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Services on major rail routes between London and south west England have been severely disrupted after a person was hit by a train.
The business executive, whose ruthless interviewing technique has won him many fans, is replacing Nick Hewer, who quit after a decade.
Recent opinion polls show Labour within striking distance of capturing the trophy seat of Finchley and Golders Green.