He proved a strong driver in most disciplines, but was most adept in sports cars, winning the 1951 24 Hours of Le Mans race, and the Goodwood Nine-Hours in 1955.

He enjoyed success in both circuit racing and hillclimbing with an ERA prior to World War II, with victories at Brooklands and Donington Park.

He entered the race driving an ERA E-type, but the manufacturer was unable to deliver the chassis in time, so Walker used his older B-type.

[4] In the inaugural World Championship of Drivers, Walker was present at the very first race, the RAC British Grand Prix at Silverstone.

Unfortunately, the pace show in qualifying wasn't matched by its endurance, was Rolt retiring the car on the fifth lap due to gearbox problems.

[2][4] A month later his victory at Circuit de la Sarthe, he finished seventh in the RAC British Grand Prix in a supercharged 1.5-litre V16 BRM Type 15, with his teammate Reg Parnell in fifth.

Their heroism in sticking to their task whilst suffering from agonising burns will enable the BRM designers to go ahead and modify the cars to make them completely raceworthy."

For the next race of the season, RAC British Grand Prix, at Aintree, he shared a works Connaught Type B with Rolt.

[2][3][4][8] Still nursing his burns from the British Grand Prix, Walker dismissed them as little more than "a bit of a nuisance", he arrived at Dundrod to race a C-Type in the RAC Tourist Trophy.

In the 1953 race, he shared his works C-Type with Stirling Moss, and the pair led in the early stages until the engine problems intervened.

Next up was the RAC Tourist Trophy, where Walker would break the lap record, but again hit mechanic troubles and Moss managed to bring the car home in third.

Some consolation to Walker, was his fine victory in the Goodwood Nine-hour, a race in which shared an Aston Martin DB3S with Dennis Poore.

[12][13] After he retired from the sport, Walker took up rabbit and chinchilla farming with Lady Ripley for a while, and even designed a type of cattle grid, but both ventures came to nothing.