The departure terminal was evacuated and a 656ft (200m) cordon put in place as a precautionary measure.Err, did the police really measure the distance out to the nearest foot? I think not.
Better in such a case to list it as 200 yards (200m).
EDIT:
oldbloke suggests "about a furlong", which has the double advantages of implying less actual accuracy, and of being little more than 0.5% different from the metric distance. 