the noise abatement procedures are usually to do with A/C track. In the London TMA we will usually inform A/C that there are no ATC speed restrictions on first contact.
The noise abatement means (in the case of Heathrow for example), that we cannot vector you before that altitude.
If you have to turn early off the SID for weather, before the abatement altitude, we have to record it - just in case anyone who was silly enough to buy a house near a major airport in the first place makes a complaint.