The Black Gang by H.C. McNeile

Take a garrulous night-watchman and an enterprising journalist; mix them together over one, or even two glasses of beer, and a hard-worked editor feels safe for a column every time. And since the night-watchman at Greystone's Steel Works was very garrulous, and the journalist was young and ambitious, the result produced several columns of the sort of stuff that everybody likes to read, and pretends he doesn't.

Mr. Day was the night-watchman's name, and Mr. Day was prepared to tell his story at a pint a time to anyone who cared to listen. It differed in detail, the difference depending entirely on the number of payments received during the day, but the essential part remained the same. And it was that essential part that was first published in one of the local Sheffield papers, and from there found its way into the London press.