Blacksheep,
That was going to be my next question as well.
Based on the current utilisation, the type of flying that the aircraft is doing compared to when it was in service and the fact that we aren't talking of +15 mins on STD, but an actual apperance at a booked display what is the reliabilty target?
It would also be interesting to see how many flying displays the Vulcan was booked to do this year and how many it actually did. I am sure the figures are somewhere, but I bet someone looking at this thread has the info to hand.