§ Mr. Hayhoe
asked the Secretary of State for Trade how many departures from the agreed system of alternate runway use at Heathrow have occurred during the last four weeks; and which runway was worst affected.407W
§ Mr. Clinton Davis
Between 26th January and 22nd February the alternation system was disrupted for a period of 30 minutes or more on nine occasions. The net result was a greater number of landings on the northern runway than would normally have been the case.