No idea but I can say that I have flown over and into Doncaster, Gamston and Sandtoft a few times over the last couple of years and the controllers have been nothing but helpful, cooperative and welcoming so if the airport owners keep funding the infrastructure what's the problem? The only slight complaint I have about Doncaster is the compulsory handling for small aircraft but even there Signature are very helpful and their pricing is sympathetic to light aircraft on genuine leisure flights.
Between Doncaster and East Midlands, if I go high enough I can get from Halton to Yorkshire with a big chunk of the trip safely in class D which I like a lot.