TEEJ,
The clue is in the captions and callsign. Aircraft that are on QinetiQ charge can hardly be said to be "in service". An amount of Mk3 flying has been conducted to gather data prior to the Mk3 Reversion programme, and to de-risk certain aspects of it. The aircraft are, of course, perfectly flyable - it is just craven inattention to detail, inexcusable project management and the usual under-investment in RW platforms that created this problem.