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 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.