Davies' first brush with fame came in 1958 when he won what was then the biggest prize awarded on British TV, £5,580 on the short-lived Granada quiz show, Twenty One.
Besides his various minor roles on film and TV, Davies was noted for his writings on Sherlock Holmes. He was Chairman of the Sherlock Holmes Society of London and also the co-founder and president of the Dracula Society. He was made a Freeman of the City of London in 1986.
Davies died of a heart attack at the age of 86 on 21 September 2010.