It seems that Dartford is on the approach path to one of London's airports. I work on the hill overlooking the Dartford crossing and there is constant air traffic over head. All of it low and slow.
The other morning at about 06.00 Hrs I was out side having a nicotine fix when a (I think) 747 went over very slowly at about 3000 feet. As she passed overhead she dropped her gear and her nose started to come up slightly. I guess she was lined up for Gatwick but my GA knowledge is slightly limited.
I will try and get some shots for the photo's section in the summer.
Will