558 is currently serviceable in the hangar at Doncaster.
The plan is to go in on Tuesday give her another wash and brush up so that she looks her best for her adoring public.
On Wednesday we'll drag her out and do most of the flight servicing.
Thursday is a crew training day with a departure to Waddington sometime in the afternoon.
If you look at post No.3223 by "Those that can" you will find the link to the "GINFO" page (which I think you have already looked at.)
You could also look at this thread on the VTTSC forum:
Vulcan To The Sky • View topic - Permit to Fly 2011/12
You will then know as much as anyone about the permit (and certainly as much as anyone employed by the trust.) As Taff has explained the paperwork for the permit is processed by MA, they have had the info for some time and the application is with the CAA.
Hope this is the information you were looking for.