So, in short, in accordance with the highest standards of the RAF, he flew a mercy mission which undoubtedly saved the lives of those wounded men. No records exist to show these men died, so his prompt and unselfish regard for himself ensured these men survived.
Nothing to reproach himself for and had the RAF top brass known, he would probably have been recommended for an award, not censure.
A brave man and I hope this gives him the easing of his conscience he so badly needs.
I think you can find enough extracts from the information provided here to reinforce that "He did the right thing" so that he has the peace he desires.
Flt Lt James Buck, I salute you.