FB
Presumably if Farnborough did get Class D, it would have to be link directly to LHR's Class A, as your ILS turn ons are not far to the SW of Fairoaks.
Futhermore, I assume that it would stretch nearly as far as Lasham to protect the MA as well as NE'ly arrivals.
LHR are already making dark noises about limiting or removing access to the Ascot Burnham route.
Visualising that Zone on the map just seems to create so many problems for other, currently legitimate, users that it scarcely bears thinking about.
Anyone going South from Blackbushe, WW, Denham, Booker or Elstree will be banging on the door, with no notice from Blackbushe traffic. Those going to the Midlands from Fairoaks, Redhill, Shoreham and Goodwood, plus anyone going West from Biggin, Rochester and Manston will expect a transit 45deg to the approaches. Add in those going East from Popham, Filton and Cardiff, South-East from Gloucester, towards the LTQ or Ostend. Those that are refused will be cutting round close to Lasham, with all the risks that entails both of meeting opposite direction traffic and, more seriously from the manoeuvring gliders.
I do hope that DAP takes a wider view than just protecting the Bizjets into Farnborough!
Timothy