I suspect it will be a combination of both Avioactive. In order to attract the buisness you have to offer minimum levels of service, its a cost based analysis that has to be done and there are alot of limitations. Everyone has their ore in this one, the airport, the company providing the service (Marshall's arn't going to want to provide just FISO they arn't interested in that alone being a big company), the CAA (i.e. they want radar units for saftey etc...), Birmingham (ain't going to want to be doing radar for coventry traffic unless someone is going to pay them).
Its a pretty complex subject.