Not quite the same, but a few years ago, RNAS Culdrose was looked at as a base in the SW for deploying Typhoons to in times of need.
However nothing ever happened - I heard rumours as to why, but never heard a definitive reason as to why it didn't happen.
St Mawgan (Newquay to kids), has a fantastic HAS site that is now only separated from the active airfield by a fence - surely this could be dusted off and made operational again?