you do not allocate a Pilot straight out of the OCU to fly HM the Queen
Couldn't imagine the Queen being allowed, by senior officers, in any aircraft where the DECU fault codes had to be checked (by the Loadmaster, looking behind a little panel in the cabin wall) every 15 minutes, in case everything was about to go pear shaped.
Pity senior officers didn't think that other very special and irreplaceable persons weren't as important.