Son of the legendary S C H 'Sammy' Davis, one of the 'Bentley Boys', Colin was an advertising executive who began his career in 1954 with a Cooper Norton, using F3 as a good learning vehicle before switching to sports cars to pursue his intended aim of racing in long-distance events.
Unusually for an Englishman with so much racing available in his homeland, Davis made Italy the centre of his activities, driving for de Tomaso and Scuderia Centro Sud in Grands Prix and sports car races. He finished 11th in the 1959 Italian Grand Prix in a Scuderia Centro Sud Cooper-Maserati.
In 1960 he switched to Scuderia Serenissima. He was also a leading runner in Formula Junior, winning at Albi in 1959 and at Pau in 1960 with a Taraschi.
His greatest success still lay ahead, though, Colin winning the 1964 Targa Florio in a works Porsche 904 GT with Antonio Pucci. This led to other races for the Stuttgart team, and he finished second in the 1965 Targa with Mitter and fourth at Le Mans in 1966 with Siffert.