Could be that 1000's of bodies turning up at Bruntingthorpe would interfere with the non aviation activities - I would be worried as well. The last thing they need is loads of people lurking on the off chance that 558 will fly, and some of the locals have a bad case of the nimbys at the best of times.
Out of interest, where will she be based when flying?
It's been nice to pop in and see the old girl when we've been testing there.