The Falcons have gone to Bournemouth as they can't trust DTVA to cope with any inclement weather. Snow/ice, clearing/treating and aircraft de-icing are a concern as it cost Cobham last year due to the inabilities of the airport.
The King Air's will move out as well until Cobham are satisfied they can operate from DTVA without any delays.
Falcons are on a 1 hour response time, so delays due to inadequate facilities will cost dearly. Quick response is also needed for the Calibrator King Air's. If an nav aid goes tech and needs recalibrating after repairs they need to be able to launch fairly quickly.