Drone in near miss scare at 700ft with Heathrow airliner | Daily Mail Online

http://www.dailymail.co.uk/sciencetech/article-2864691/Drone-near-miss-scare-700ft-Heathrow-airliner.html

Incident was rated as risk rating of A - the most serious of near-collisions

Pilot spotted the drone at 700ft after air traffic control radars had missed it