You do not have to be a pilot to be the Captain of certain UK Mil Plc fleets. I think the Nimrod fleet started the trend. Apologies to those allergic to the word 'Nimrod'. One is assuming that this situation is now valid in the Navy, although when using 'civilian owned' aircraft (King Air) I would have thought it unlikely.
Regarding the Senior Officer 'Air' cadre: Is it not true that Air Officers get 'appointed' whereas Gp Capt & below get 'promoted'. Meaning that Air Officers can find their services no longer required whereas the mortals have to be made redundant.