Pay peanuts, get monkey's..
I don't know why the MOD do not take on the Civilian approach, have several local contractors who do the work at airfields as required, with an office on base to oversee it, that way you can control costs as they compete for the work and ensure it is being done.
From what I see, this lot were simply a middleman in a lot of the tasks, and having not paid your contractors, they are on a hiding to nothing.