Slater died on 8 March 1938 at the age of 73. He had married, in 1897, Violet, daughter of Joseph Oakeshott, of East Barnet, and Eliza Maria, née Dodd; she was a sister of the civil servant and Fabian Joseph Francis Oakeshott.Radical Reformers and Respectable Rebels: How the two lives of Grace Oakeshott defined an era, Jocelyn Robson, Palgrave Macmillan, 2016, p. xviiFull of Hope and Fear: The Great War Letters of an Oxford Family, ed. Margaret Bonfiglioli and James Munson, Oxford University Press, 2014, pp. xxxiii-xxxiv
