I see that he married Ellen Hartshorn and that there were two children, Winifred Pearl born 1908 and James Leslie born 11 November 1909, married Nellie Bale in 1932 and died in 1977. It may be that the name Leslie might be a clue.
I see that a James Maxwell, aged 31, died in Billesdon in 1915, and Ellen Maxwell married George Kenn(e)y in Leicester in 1916. Do you know what the cause of his death was?