http://forums.theregister.co.uk/forum/2/2014/12/12/all_london_airspace_down_due_to_major_outage/#c_2387268 http://forums.theregister.co.uk/forum/2/2014/12/12/al

http://forums.theregister.co.uk/forum/2/2014/12/12/all_london_airspace_down_due_to_major_outage/#c_2387268 http://forums.theregister.co.uk/forum/2/2014/12/12/all_londo... Allegedly UPS failure.