118.7
exactly what i was getting at, involve and engage people early and you have much better chance of success rather than spending ages on the technicalities and preferred solutions only to find out no one likes them. And as you pointed out affected communities could be a good way from the airport and may not immediately come to mind as 'affected areas' in my experienced-having lived close to and around LHR for about 50 years people are very sensitive to change, most noise is a background issue unless you live at Hatton Cross or similar, and people are very sensitive to change if its time of day. loudness or pitch. In fact one of the problems is that comparing sound measured and perceived sound are often very different things