Interesting potential - OXF
They seem to have spent lots on the infrastructure to be able to take the Air Southwest Dash-8-300s with the new runway,ILS,terminal,fire and rescue, security etc. but that was all for business aviation. Looks like the business aviation ambitions may have stalled so they are getting into scheduled stuff. If they had a proper terminal, going up and down the M40 makes it a better bet than another runway at Heathrow!
With a 1552m runway you can get in the Q400 easily and some of the Embraer jet family,RJs, 146s etc. even the A318, Sukoi Superjet etc.
All the VFR pilot training side was moved to Arizona so they are dead quiet now, so masses of capacity and no restrictions on commercial traffic like Farnborough or Biggin Hill.
Twice daily to Edinburgh, Glasgow, Dublin, Amsterdam, Newcastle etc. would seem to make sence with anything from 19-seaters to Dash-8s or ATRs. Summer charters to Jersey and winter runs to the ski resorts and at the heart of the home counties and Thames Valley area they've got an affluent catchment area.
Makes quite a lot of sence? Next stop would be global hub at Upper Heyford with high speed rail doing 45 minutes into Marylebone. Forget Heathrow and Stansted runway - go west (O.K. north-west-ish).
Note this is in David Cameron's back yard?!