The ones of the aircraft flying have fooled your camera's exposure meter into thinking it's a brighter day than it actually was (all that sky has fooled it). I've tried to lighten and brighten one of them but if you've access to your own editing software you'll probably be able to do a much better job than this.
I lived briefly at Ruislip as a very young chap, I took to trying to dive from the top of a kiddies slide at the age of 4, don't think I damaged the Tarmac at the bottom too much, still got a scar on my chin and wonky teeth though. Also have a vague recollection of a white Christmas must have been either '68 or '69.