Perhaps the CAA is rather less convinced about drone safety than the FAA?
Single engined aeroplanes must always be able to glide clear of congested areas. But if some drone goes walkabout, no-one can be sure where the wretched thing will finally crash to earth.
So the drone operators can only watch their TV screens helplessly, whilst agonising over which doughnut to have....
Which of the UK's risk-averse RAF commanders would dare to approve the flying of a drone over a congested area.....?? One day, perhaps, when they have proved their reliability. But not just yet.......