I was standing in Battersea Park and saw the last scheduled BOAC? Comet 4B on finals for LHR. When was that? I've been up the front of a BEA comet in the cruise. I also saw a Dan Air Comet being pushed back at LGW when the tow bar became detached and went up into the flight deck. The expensive mistake was the tug driver selecting reverse and trying to pull the thing clear. The other incident that same day was a Dan Air 727 being pushed back when a trailing edge connected with a fuel bowser.I digress