"The idea of a planning "cap" seems a rather Luddite approach to the increasing demand for air transport, imposed by backward-looking councils to emphasise their own importance."
Alternatively a democratic response to the concerns of their voters and taxpayers who have to suffer noise and congestion so you can avoid the "jungles of LHR & LGW"
That's the problem - no-one wants any development near them - I'm sure you'd be the same if they decided to build a new motorway 400 yards from your rose covered cottage N of Bristol...................
