Background
The Alvis Speed Twenty–Five was launched in October 1935 to widespread acclaim, with Motor magazine saying of it:
“In the Alvis Speed Twenty–Five the makers have produced a car which will delight those who appreciate fast motoring with an ample margin of safety. A very quick response to the accelerator is matched by exceptional steadiness under heavy braking conditions, light and accurate steering, and road holding of that special quality which is so rarely encountered nowadays.”
Sitting on the Speed 20’s SD chassis and powered by the engine from the 3½ litre car that had been introduced a year earlier, it was updated from the original SB series to the SC for the 1938 model year. The newer car had a touch more power thanks to the ‘short stud’ cylinder head and, in 1939, a dual exhaust system.
The car you see here, one of the 1940 model year cars, has even better performance thanks to an increased compression ratio; two adjustable tie-rods dampen vibration too, and other engineering triumphs include a balanced seven-bearing crankshaft, a unique spring-cluster overhead valve gear, and triple SU carburettors.
It all added up to an astonishingly smooth-running engine – and a nigh-on three-figure top speed thanks to the 3571cc, straight-six engine’s 108bhp @ 3,800rpm.
A four-speed all-synchromesh gearbox is a sophisticated touch for the period, and it has the handling and braking to match its performance thanks to a chassis that features independent transverse-leaf front suspension and large-diameter four-wheel drum brakes.
The factory-appointed Charlesworth coachwork you see here comprises an ash frame with aluminium used to strengthen the A- and B-pillars as well as for cladding. It was a more expensive alternative to the Cross and Ellis offering and on a par with Park Ward.
That said, by 1938 only Offord/Carlton (in very limited numbers) and Vanden Plas were building coachbuilt bodies for the Speed 25/4.3 Alvis chassis as Charlesworth had by then taken over responsibility for manufacturing the last of the Cross and Ellis tourer coachwork.
By volume, the owner tells us that on the 25 chassis Charlesworth built 329, Cross and Ellis 39, Offord four, and Vanden Plas 10. Mayfair built one, as did Salmons, with another two coming from Lancefield. “There was not really any competition for the Coventry coachbuilder as Alvis were happy for all Charlesworth coachwork installed in their chassis to go out to distributors without any factory check.”








