Boy band McFly are performing in Oxford Street today to mark the start of a car-free day in the West End.
Oxford Street and Regent Street are pedestrian-only today for the eighth year running.
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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.