Leslie Allin Lewis was the only child of Arthur Henry Lewis (b. 1872), a brewery expert according to the 1911 UK Census, and Catharine (sometimes Catherine) Mary Ann Allin (1870-1962), who were married at Wantage, Berkshire, in the spring of 1896.
Leslie grew up at the Allin family estate at East Hendred in Berkshire, and was educated at Roysse’s School in Abingdon (now named Abingdon School). As a boy he wrote and illustrated a series of stories about a panther named Blackie. During World War I he joined the Artist’s Rifles, and trained as a pilot, taking his certificate on the Maurice Farman Biplane at the Military School in Ruislip, on 29 May 1917. According to Richard Dalby, he served in France for a year, and after the war he took a co
