IMHO, I'd imagine that as permission to increase flights @ City Airport has been granted, the chance of getting that decision overturned is insurmountable ?
Surely, the focus of attention should be on Boris Johnson's proposal to relocate Heathrow to the Thames estuary ? Which presumably would free up flight paths over Forest Hill, and thus see some of City Airport's traffic reruoted away from the hill ? Not that I know anything at all about flight paths, it's just a thought.
Personally I agree with moving Heathrow to beyond Southend for many common-sense reasons...
Comments welcome, no doubt a new debate will ensue...