Why doesn't the UK implement Class E airspace. You could then protect the instrument approaches with Class D, stick a layer of Class E on top, which would allow VFR traffic access across the zone without undue burden on ATC. In the case of IFR traffic, they would also be protected in the Class E by ATC.
Why doen't the UK consider more use of VFR corridors through airspace? An example is LAX and most other large airports in the states, you enter the corridor at a defined location, one altitude for one direction, one for the other. You sqwark a particular code which allows ATC to see your intentions, even though you are not communication with them, and you announce your position during the course of the transit. This way, convienient routing for VFR traffic, and less burden on ATC can all be accomplished with comparitive ease. In the above example, as many of you already know no doubt, you can transit LAX right overhead without talking to a sole. Stick one of these corridors across each Class D zone, and life would become much easier for everyone.
Cheers
EA
