Not so difficult to do a few more routes - OXF?
Goatface - so what if they can only handle one rotation at a time? If they can only do one at a time, that's what they'll do. In one day they could still comfortably do say four or five rotations of 50-seaters, spread through the day. Stick a few Portakabins down like say Coventry and bring in a few more staff and you could easily do more.
Clearly, the fact that they are doing one 50-seat rotation already today means they are already there, all the infrastructure for that to be legitimate is there now. There are no obstructions to them doing more other than manpower and elbow room.
OXF is at least an hour from any other option be that BHX, LHR, SOU so the catchment area is good, prosperous, business-oriented etc. If the experiance is hassle-free at the airport, there are people living on Heathrow's doorstep that would drive 45 minutes up the M40 to travel from a 'regional' airport. People in Swindon, Northampton, Reading, Oxford, Milton-Keynes etc. would give serious consideration to going there instead of say Luton, Bristol etc.
I can't see what the problem is - the runway is exactly the same as LCY and now they've got all the boring stuff sorted - RFF, ILS, Security etc.
Good luck to them - got to be good for UK aviation in general, a new commercial opportunity? Otherwise it will be a housing estate in 10 years - probably the direction Coventry is going in - sadly!