The President of the United Arab Emirates arrives in London today for a two-day state visit. He is being formally greeted by the Queen and the Duke of Edinburgh.
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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.