There are two published short stories so far, though I believe there is another which was written for the Crime Writers Assoc of America, I haven't been able to obtain a copy yet. The ones I have are: -  

My Old Man's Trumpet (1957)
A Matter Of Months (1976)


And a magazine article: -


A Little Peace Of Britain (1980)




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As well as his own work, Bagley also contributed an introduction to Crime Wave - World’s Winning Crime Stories 1981

CrimeWave