The Met Police is re-thinking the way it deals with cases involving vulnerable people, by drafting in the help of specialist nurses.
Officers will work alongside medical teams in cases involving people suffering from mental health problems, to make sure they get the specialist care they need.
Today, Marcia Rigg whose brother Sean died in police custody, welcomed the changes - but said they don't go far enough.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants