boe777.... As John R suggested, there are 4 stacks in use all the time. Traffic from Scandinavia, Germany and various points east goes to Lambourne; traffic from Scotland and the north to Bovingdon; traffic from France, Italy and the southeast goes to Biggin Hill and traffic from the southwest and west goes to Ockham. Traffic at Bovingdon and Lambourne are on one frequency whilst that at Biggin and Ockham are on another. When the aircraft have left the stacks and commenced descent they are all then transferred to another frequency for final vectoring.
Last edited by HEATHROW DIRECTOR; 10th July 2009 at 18:01.