For the gentleman contemplating corporate shuttles using the likes of Biggin Hill or Farnborough, you should be aware that niether is permitted whatsoever to undertake scheduled services, or 'pay for seat' operations of any kind - whole aircraft charters, not 'airline' services.
That leaves say Cambridge, Cranfield, Oxford, of which Oxford has by far the better demographics. Forget Lydd, Manston etc., hopeless.