Almost 200 court cases in London are dropped or delayed every week because of prosecution failings. New figures show that in a year 9,560 cases were thrown out or delayed in the capital. That works out at 184 every week.
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Police have released an e-fit of a man suspected of attacking her.
The force has been tweeting after carrying out a series of dawn raids.
Adenike Akingbogun made the dangerous manoeuvre after ignoring the crossing lights and driving onto the tracks.