RAC British Grand Prix in a supercharged 1.5-litre V16 BRM Type 15, with his teammate Reg Parnell in fifth. Both drivers legs were so badly burnt by heat from the engines and exhaust systems that even walking was painful. Gregor Grant reported: "Parnell and Walker saved the day for British motor racing. 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." Sadly, Walker did not race the BRM again. After four years away, he returned to Formula One, racing twice. The first was aboard Stirling Moss's Maserati 250F, where he retired from the Grote Prijs van Nederland, with mechanical issues. For the next race of the season, RAC British Grand Prix, at Aintree, he shared a works Connaught Type B with Rolt. In what turned to be his last Grand Prix, the car was retired with a failed throttle after just 19 of the 90 laps. Sports Car Ace Walker performances of the hills brought him to the attention of Lofty England, the manager of Jaguar's sports car racing team, rewarded him with a drive in a Jaguar XK120 in this newly launched car's first race at Silverstone in 1949. Walker finished second, but won at same event 12 months later, in an alloy-bodied works-prepared XK120. After the success of XK120, they developed an endurance racing version, the XK120C, or C-Type and need a driver. Walker was approached and with it, Jaguar embarked on their first racing program aimed at winning the 24 Heures du Mans outright. On its first attempt, just six weeks after completion, Walker achieved the victory for which he is best remembered, when he and co-driver, Whitehead won the 1951 race. Of the three entered, they filled the top three positions after four hours. However, after just 50 laps, only Walker's remained in the race. The victory providing the Coventry marque with much publicity and acclaim. 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. Jaguar cleaned up, taking all three places in the podium. As for Walker, he finished in a dutiful second behind Moss. In the 1953 race, he shared his works C-Type with Stirling Moss, and the pair