In London, over the airport the aircraft nearly collided with a UFO

Date of sighting: March 6, 2016
Location: London, Great Britain
Long Description of Sighting Report
The object,which didnt seen to have any solid shape seemed to fly towards an airliner as it was landing about a mile or two from heathrow then seemed to change direction and fly away from the airport direction.There was no noise an it didnt seen to be going too fast..I thought it was strange that it was flying very close to the heathrow inbound flight path.