Lennard Robert Bradley was an accountant and had been travelling back and forth between UK and Nigeria since 1909. He and his wife Gertrude Ellen (nee Froggatt) had arrived in UK on 10 June 1917 and he was returning to Lagos on the Umgeni. I doubt very much that he was in the army. Addresses to check out: 5 Rosemount Terrace, North Finchley https://www.ancestry.co.uk/imageviewer/collections/1518/images/30807_A000636-00169and Eastham Court, Tenbury https://www.ancestry.co.uk/imageviewer/collections/1904/images/31874_222791-00304
Thank you, may I ask where you discovered that he had been travelling since 1909?
Passenger lists (L R Bradley). To Forcados 1909, 1910, 1911, and to Lagos 1913,1914,1916.