By the late 1930s, Alvis had reached the zenith of its pre-war development, and the 4.3 Litre model stood as the ultimate expression of the marque s six-cylinder lineage.

Introduced under the direction of Captain George Smith-Clarke, the 4.3 Litre was based upon the highly regarded Speed Twenty Five but featured a significantly enlarged seven-bearing overhead-valve engine producing some 137 horsepower on triple carburettors.

With independent front suspension, servo-assisted brakes, a four-speed all-synchromesh gearbox and driver-adjustable hydraulic dampers, the chassis embodied the advanced engineering for which Alvis had become renowned.

Contemporary road tests placed it among the very fastest un-supercharged touring cars of its era, capable of a genuine 100 mph, while offering refinement and durability to match its performance.