of those 4 only 1 has more than 12 months seniority.
For the sake of the future existence of the Royal Air Force I would seriously suggest a far more comprehensive head hunting project is called for than merely invoking "Buggins turn". The RAF needs a new Trenchard to arrest its decay and ensure its survival into its next century, never mind beyond that. He was ex Army. The only chiefs prepared to stand up and be counted are Army, now where might we look....?