London Mayor Boris Johnson says there will be a possible 2016 reopening of the Olympic Stadium, saying it was not built to cater for everything and it will take time to do roof seats etc.
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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.