Police are hunting a woman who stole a poppy appeal collection box from a pub in north London.
CCTV video shows her using other customers as a shield for what she was doing.
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Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.
The unfortunate officer was taken to a central London hospital for treatment and his condition is not life-threatening.