Born in Aberdare, Glamorganshire in 1889, son of Thomas/James Jackson, engine driver with the Great Western Railway, and Alice nee Jackson. They lived in Fulham, London in 1901. Llewellyn attended the Night School in Wheatley from 1911 - in the Census of that same year, he was enumerated at Station Road: he was a signalman with the GWR. The Oxford Chronicle noted that, together with Frederick Merritt, he had been recruited to Royal Garrison Artillery's Heavy Battery: he rose to the rank of Sergeant, with the Regimental No. 75, 291387. He married Oxford-born Edith Ethel Abraham on 27 December 1919: she was a servant at Wheatley Vicarage. Llewellyn and Edith were living at The Firs in 1921. Llewellyn died in December 1962 at the Cowley Road Hospital and Edith died aged 82 in June 1964. See also references to him in the Wheatley in a World at War chapter.