Many thanks for informative and helpful replies so far received. It is Chriss that I'm searching for (after a long gap in my family history work). I actually traced a son of Tom Kershaw B, who told me that his father never mentioned having a brother, yet Chriss and Tom appear together in all the relevant census returns. Makes me wonder whether Chriss had done something unspeakable, to cause his alienation from his birth family, as well as from his wife and son.
I will certainly follow up the suggestion of trying the 1939 data with Chriss Buckley's date of birth (21 December 1895, Rochdale, Lancashire) ... and any other suggestions.
Again, many thanks to all.