Regarding the Met office site and new taxiway. If this was to happen the Fire station would have to be demolished and stand 60 plus adjacent stands closed.
I think much bolder measures are required to solve the bottle neck.
1. demolish part of the cargo sheds (they dont need to be next to the airport)
2, build a new taxiway around the rear of the hangers, joining up around link B. Landing traffic for terminal 2 could simply continue the roll and exit along the new taxiway, completely avoiding the fire station area. For 06 departures the flow simply goes into reverse