Quote from VTTST's website home page:
"XH558 was scheduled to take off at noon on May 28th for a crew currency and display training flight. Just after the start of the take-off roll, she experienced problems with two of her Olympus engines. The crew immediately shut all engines down and everyone is safe. At this stage, we don't have any further information but we will keep supporters informed via Twitter (@XH558), Facebook (Vulcan XH558) and the news section (here) of the charity's website (www.vulcantothesky.org).
Unfortunately, this means that she will not be able to fly for at least two weeks, although we will not know exactly how long rectification will take until the problem has been thoroughly investigated.
We will provide further updates when we know more."