Chugalug2
I doubt that the current airworthiness situation debilitating as it is would have much effect on the air fighting capability of the U.K.
In a national Emegency all the airworthiness bull and those who spend a working day polishing their rear ends on office furniture while debating the correct formular of rubber for use in wheel chocks will be brushed aside.
I am old enough to have been apprentice to a bloke who was maintaining RAF aircraft in 1939, he told me that within days of the declaration of war a whole raft of piece time maintenance practices had been swept away and did not return until well into 1946.
No doubt the rate of maintenance related aircraft losses was just lost in the fog of war and considered just part of the cost of doing business.