experienced, keen, civvy A330 pilots like DC are possibly more valuable to Air Tanker and the RAF than trying to convert jaded, hacked off ex AT RAF pilots to the A330...
Or conversely, the RAF might be better converting healthy, experienced AT pilots with a strong military ethos and buckets of airmanship, rather than Air Tanker recruiting unfit, military wannabees with nothing more than a few years spent flying down an airway on autopilot.