As I understand it, the additional access/exit taxiway works will be done at the same time as the planned resurfacing of the southern and northern runways (2013 and 2014, respectively), unless anyone knows better.
I would have thought doing anything for Cranford in 2013 would be pushing it in view of all the rigmarole of Environmental Impact Assessments and consultation....
However, I guess that most of the works would be in connection with the northern runway, so 2014 might work.
Incidentally, has the link 60 Grass Area 6C taxiway been done yet ?
The proposed additional link between Alpha and Bravo Taxiways would be used as additional holding areas for aircraft waiting to taxi onto the Terminal 5 apron, as it would allow a second aircraft to overtake one nearer to Terminal 5 without the nearer aircraft having to move. This situation would occur when the stand allocated to the second aircraft becomes free before the stand is available for the leading aircraft.