Daisy Howarth's flight was on the tarmac bound for Cuba when a tannoy announced that the runway was closed because of an emergency landing. Hear the account she gave to ITV London:
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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.