Background
The evolution of the XK150 started back in 1948 with what could be claimed as the most fortuitous “accident” in post-war motoring history. It is claimed that the XK120 was designed in less than three months by Jaguar’s founder Sir William Lyons and his chief engineer, William Heynes. Originally the car was conceived merely as a show car and test bed for the new XK engine which was slated for full-scale production for the Mark VII saloon. Maybe this is why the design process was so hasty. The “XK120” nomenclature was a nod towards the car’s XK engine and the 120mph (plus) top speed that the former was able to push the lightweight body to achieve.
The XK120 was revealed to the public at 1948 London Motor Show in open two-seater form. In the austere, post-war climate of 1948 the XK120 clearly struck a chord of optimism and recovery. The XK120 was universally well received. The sophisticated DOHC six-cylinder engine seemed like a unit previously only offered with cars for the super-rich like Stutzes and Duesenbergs. The fact that it was sat on a stand at Earls Court with an indicative sticker price of just £999 meant that it would be exponentially more attainable than those rarified offerings. Such was the furore caused by the curvy XK120 that it was hurriedly rushed into production in 1949.The first 200 were painstakingly hand built in aluminium. With public demand egging them on Jaguar retooled to produce in volume and in steel in 1950.
By 1954 Jaguar responded to early market feedback by evolving the XK120 into the XK140. The XK140 offered more power, more space, improved refinement and better steering and brakes. The metamorphosis from stripped out sports special to sophisticated GT continent crosser had begun. That developmental arc reached its apogee in 1957 with the release of the XK150. This time the body was all new offering a wider cabin and improved modernity with features like a curved windscreen and better weather protection. Disc brakes all round moved the technical specification on, too, and the legendary XK unit received a few tweaks in the process as well. Around 9,300 XK150s would be built between 1957 and 1960 with around 47% of those being Fixed Head Coupes.








