Kew Gardens has been closed to the public "as a precaution" after a severe weather warning for London. It comes after a woman was killed by a falling branch on Sunday afternoon.
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The robbers casually approached their victim on a busy high street before before spraying a noxious substance in his face.
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.