The ninth child of Avram Chaim (Hyman) Davidovitz (1866–1925), draper and tailor, and his wife, Hannah (Annie), née Salit(1878–1958), Jewish immigrants from, respectively, Poland and Vilnius in Lithuania.
After his father's death the family moved to Streatham, in 1929 when the family name was changed to Davidson. Lionel attended school in Tooting
In 1950 Davidson became the fiction editor for John Bull, publishing the short fiction of many best-selling writers including Graham Greene, Nevil Shute, and Agatha Christie. He continued to write his own short stories and radio scripts for the BBC
The Night of Wenceslas quickly sold for a film but when the film did appear in 1964, as Hot Enough for June (American title Agent 83/4), it had been transformed into a romantic comedy vehicle for Dirk Bogarde. The Rose of Tibet was published in 1962 and Run for Your Life, published in 1965
In total he wrote eight crime and thriller novels.
He is said to have been planning a novel set in Tooting in the 1930s when he died in February 2016.
(Source:extracts Mike Ripley and Photograph by Yvonne Plaut, Camera Press, London