No reference is made in BA to Jeppesen/Aerad or any other source for noise abatement procedures apart from the specific runway BA Performance Manual Take-off procedures. All special noise abatement procedures are incorporated there. I can't remember what the procedure is, therefore, for SYD 34 for instance, but if a 3000' cleanup is required, a 3000' clean up it will be. I think I recall doing 3000' clean ups on this runway. Both pilots check this manual on every take-off, or when ACARS is in use, printed instructions will be sent to the aircraft with the take-off figures.
As that is the case, I'm sorry, but if it is required and the observer thinks he has observed otherwise, he is simply mistaken.