Originally Posted by
Schwann
Indeed. The white flashing strobe lights on each wing and behind the tail were turned on, as well as the red flashing beacon on at least two aircraft parked on stand.
It's really strange... regularly only ever see it at T5!
Most likely the engineers performing the daily check. Common to see at other UK airfields late at night as aircraft return to their home base. At LHR you would see the 320s strobing away, just there are no flights at that time. The Long Haul hulls get the 'once over' whenever they happen to pop home to mum with a pile of dirty washing to be done.