Those of you who are interested can see an animated gif of the PlanePlotter network's view of UK airspace from 0600 to 0900 here:
http://i43.tinypic.com/2vmtsnq.gif
It clearly shows the traffic dispersing and everything going very quiet.
There's another 3 hours worth here:
http://i42.tinypic.com/1zqadkh.gif
This is from 0900 to 1200, and it's even quieter....