A novel's been growing in my head since Saudi, and its time has come. I'm not going to spill any creative beans here, but I will give details of the research, (which may give some clues): First World War especially life in the trenches; Glasgow in the 1920s; Territorial Forces just before and during FWW; crime and punishment in Glasgow, 1920s; Scottish state schools, 1920s; Teacher education, 1910-20.
To get started, Jenkins, 1974.
Jenkins, A. (1974). The Twenties. London: William Heinemann Ltd.