It is quite possible that BAA have a point in their report and I have sympathy for those who wish to see a 3rd runway.
However, there is far too much conflict of interest in the owner of Heathrow publishing a report into why Govt should allow Heathrow to do more and why airlines can't go to Gatwick or Stansted (which happen to be either owned by a rival or likely to be soon)
It's just not possible to take this report seriously given BAA's past monopolistic behaviour - it reeks far too much of spin and lobbying.