Doreen McIntyre from campaign group 'Harefield Against HS2' spoke to our Political Correspondent Simon Harris and described how a new viaduct planned for the building of HS2 would change the face of the area.
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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.