[3] In 1910, he joined the staff of Automobile Engineer, just then being launched by Iliffe (also publishers of The Autocar) as a technical illustrator[3] and was by 1912 also a writer and sub-editor.

[2] At the start of the First World War he joined the Royal Naval Air Service and served in France with armoured car section.

[2] While best known as sports editor of The Autocar, writing under the pen-name Casque (French for helmet), Davis also competed in many forms of motor racing in the 1920s.

[citation needed] As sports editor, Davis aided his prewar motorcycling associate, W. O. Bentley, in starting his company.

Davis, will always remain an epic, and even if the competition was not as keen as in the past, it is great thing to have won a race with a car which was damaged in the early part of the event.

[9] At Le Mans that year, Davis became the stuff of racing legend when, at the wheel of the 3-litre Bentley "Old Number Seven", he skidded into a pileup at White House and saw the chassis twist, but nevertheless went on to win.

[3] He would also come second at the 1929 Saorstat Cup, Phoenix Park, and at the Brooklands Double-Twelve (24 hours in two shifts, because the track was prohibited from holding racing at night) and 500 mi (800 km).

[14] Also at Brooklands that year, Davis set several Class H records in the Seven, including a flying kilometre of 89.08 mph (143.36 km/h).

[14] On 15 April 1937, Davis drove a Frazer-Nash BMW round Brooklands, covering more than 100 mi (160 km) in an hour, at an average speed of 102.22 mph (164.51 km/h)[16] The same year, his Wolseley earned "a special award for being the best-equipped car to finish".

[14] Davis also acquired an 1897 Léon Bollée Automobiles tricar, which he named Beelzebub, and continued to use into the 1960s before selling it to the Indianapolis Speedway Museum.

[17] He also served on the Competitions Committee of the Royal Automobile Club, the governing body of motor sport in the United Kingdom.

He owned a Bug-eyed Sprite and an 1897 Léon Bollée tricar, called "Beelzebub," which he took on the annual London to Brighton Veteran Car Run.