IMHO there isn't any point CWL even attempting to compete with BRS. The battle has been lost and I'd be surprised if traffic recovers to even 2mppa levels overnight. The catchment area and average income of the local population determine the ultimate demand.
It needs another business model.
Get GECAT to build a few level D simulators on the southside, or Lufthansa Technik to put a MRO facility there, or QinetiQ to build a few wind tunnels for some super R&D establishment.
Oh but that'll mean someone actually bothering to build a road to the airport which will actually help you get there, or a train for that matter.
Blueskies man, blueskies...