Humberside manages quite well without class D
Ironically, Humberside were applying for class D at exactly the same time as Donny, but, despite having a much stronger case for Class D, Huy ATC Management didn't exactly handle the process properly whereas Doncaster's knew exactly what they were doing. They've got Class D, it's unlikely to dissapear anytime soon. HUY haven't and never will get it.
Doncasters passenger figures remain significantly better than HUYs, despite the lack of movements in the Socialist Republic and depending upon the day of the week, that's what the CAA take into account.