Actually, had the Beeb qualified the statement by explaining that aircraft over the Atlantic need to be separated by 300m vertically and 96km if at the same height, they wouldn't have been too far from the truth, though they could have used good old fashioned feet and nautical miles. Whilst vertical separation is 1000ft nearly everywhere, oceanic tracks are separated by 60nm. At the same height on the same track, aircraft have to be ten minutes apart which is 80 nm at 480kts.