Pre-war development of the six-cylinder Alvis culminated in the announcement of two new models for 1937: the 4.3-Litre and the 3.6-litre Speed Twenty-Five, both powered by new seven-bearing, overhead-valve engines.

The cruciform-braced chassis were similar and embodied the kind of advanced thinking long associated with the marque: independent front suspension and a four-speed, all-synchromesh gearbox - introduced on the preceding Speed Twenty - were retained, with the additional refinements of driver-controlled Luvax hydraulic dampers and servo-assisted brakes.

On test with Autocar , the Speed Twenty-Five demonstrated remarkable top-gear flexibility combined with a maximum speed of 95mph, and was found to possess qualities of, 'quiet running and general refinement in a striking degree.' This particular Alvis is an example of the SC-type Speed Twenty-Five with the all-synchromesh gearbox and independent front suspension, making it one of the more technologically advanced British cars ...