Widow Pamela Schutzmann has just won a lengthy legal battle to win back her £800,000-pound home in Hampstead, which was sold without her knowledge. But she has lost her life savings of £400,000.
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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.
Police arrived at the 73-year-old's home after Alfie chased a delivery man.