Reading Steam Railway it appears that one other preservation scheme sent one of its locos to Llangollen for overhaul, but it was removed because the work done did not improve the loco's condition, - apparently the reverse. Another group employed them to fit some newly made parts to their loco., but, after removal from the site, it was found that the work had not been done satisfactorily and, in the process of dismantling to re-assemble correctly, the new parts were damaged beyond repair. These are of course only one side of the story, but. if true, it might be reasonable for the organisations concerned to try to recover costs from Llangollen. If the administration means that they will not be able to do this, it will have a knock-on effect on those other groups' finances.
Having visited the Llangollen a few times (not recently) I have the following observations to make;
Parking in Llangollen seems to be actively discouraged. Fair enough to park at the station at the other end, but the timetable seemed to be based on Llangollen, so if one went to the other end, one misses out on the first and last trips - relevant on a Gala Day as individual locos do not work all day.
Having been charged a tidy amount for a Gala Day ticket on the day, I was then asked for another £5 for a timetable !!!
My experience of the Llangollen buffet staff was similar to the view posted up-thread - i.e., negative and unhelpful. But, sadly, I've had experiences of catering at other steam railways that makes this seem far from unusual.